Kid Flash and his fellow Teen Titans recently attempted to rescue the child clone of Superman, Superboy, from the mysterious organisation N.O.W.H.E.R.E. but were stopped by the villian, Harvest. Bart has recently been entered into the free-for-all tournament called the Culling. Bart, the Teen Titans and the Legion Lost recently defeated a large group of Harvest's minions during this fight Bart was attacked by Timber Wolf who seemed to know about Bart's earlier life in the 31st century but Tellus managed to stop his teammate, Timber Wolf, before he did any damage.
After the battle with Harvest's minions the Teen Titans and the Legion Lost battled Harvest himself, the team were not winning the battle so Red Robin, the leader of the Teen Titans, decided to send the Legion Lost to destroy the crucible's main power core to shut down N.O.W.H.E.R.E. this worked but Harvest escaped after revealing he was human to Red Robin. Bart and the Teen Titans escaped the Colony so they wouldn't be destroyed by the power core exploding. After burrowing several miles underground the Teen Titans landed on Mystery Island, Bart woke up and was shocked when he discovered a live dinosaur standing in front of him.
When Bart fully awakens he quickly ties up the dinosaur so it can't atack him or the rest of the Teen Titans. Bart then grabs Tim, Miguel and Kiran and runs them up to a safe place. Bart is later seen racing with dinosaurs and Solstice trailing behind, Bart talks to Solstice for a while but then lies down on the grass with her and kisses her. After battling Loose Cannon, he and Miguel were watching, reputedly, the funniest show in Latin American as Kiran cleaned when the lights suddenly went out. Racing to check the fuse box downstairs, he was knocked out by an out of control Wonder Girl.
Bart is also tracking down three "Dino-Teens" that managed to escape Mystery island with the Teen Titans.
Bart, along with Bunker and Solstice, are currently in a small hospital after his fight with Wonder Girl.
Bart was born in the late 30th Century, around the time of the Legion of Superheroes, and was the son of Don Allen (the son of Barry Allen, the current and silver age Flash) and Meloni Thawne, the daughter of Professer Zoom. Bart was born with his grandfather’s super speed, this came with it's serious downfalls. Bart suffered from a hyper-accelerated metabolism, this meant that Bart was aging a lot faster than a normal person and he would die of old age at a very young age. For example, when he was 2 years old he looked physically 12. To stop Bart from developing mental problems, Bart was placed in a VR (virtual reality) simulator which creates a virtual world that kept pace with his unusually fast growth.
When it became clear that the simulator was not working his grandmother, Iris Allen decided to take Bart into the past (our present) to see her nephew, Wally West, while he was the Flash, in hopes Wally would have a solution to his cousin's problems. Wally made Bart use his super speed at new levels. This extreme burst of speed shocked Bart’s metabolism back to normal. Because Bart spent most of his childhood in the reality simulator Bart had no concept of danger and would often act before thinking, this ended up with Batman giving him the name, Impulse. Bart proved too much to handle for Wally so Wally passed him over to the veteran speedster Max Mercury. Max moved Bart to Manchester, Alabama, where he taught Bart about the Speed Force and how to use his powers responsibly.
Bart Allen was created by Mark Waid and Mike Wieringo. Bart Allen made his first comic book appearance in the pages of The Flash #92. In his first appearance he was in his Impulse persona. Bart made his first appearance in his Kid Flash persona in Teen Titans #4. Bart would later go on to take the prolific mantle of the Flash in Infinite Crisis #5.
Batman gave Bart the name Impulse as a warning not a compliment. Bart was one of the founding member’s of Young Justice along with Robin (Tim Drake) and Superboy. For a time, Impulse came into the possession of a space ship given to him by a rich man in thanks for saving his castle. The team used the ship to reunite Doiby Dickles with his queen and restore the rightful rule of Myrg. Impulse stayed with Young Justice for a long time becoming best friends with Tim Drake and Superboy who he actually stayed with for the majority of his time in the Teen Titans.
While in Manchester, at Manchester Junior High School, Bart became friends with Preston Lindsay and Carol Bucklen. On his adventures Bart has helped Preston to come forward about his mother abusing him ,because he was apparently upsetting his father, and helped Carol's brother to get his job back which he needed to provide for their family with both of their parents gone.
Bart's mother would eventually come back in time to see her child and bring him back to the 31st century. His mother quickly demonstrated whom he had inherited his impulsive nature from. Unfortunately president Thawne still held a grudge against the Flash's family so in the 31st century Bart was a wanted boy along with relatives he had in that era including his cousin Jenni a.k.a. XS, a future member of the Legion of Superheroes, although she was merely a baby at the time. In order stop the feud between the Thawne and Allen families Bart's mother, Thawne's daughter, Meloni Thawne agrees to stay with her father in the future and be his little girl again while Bart goes back to the past. Thus separating Bart from his mother.
During his time with Young Justice Bart discovered he had the ability to make speed force duplicates of himself that he could send through the time stream. They could remain in their selected place for a certain amount of time before they had to return to Bart and when they returned they would rebound with Bart and Bart would learn everything his “clones” learned but when one of his duplicates got killed Bart got the trauma from it. Bart has not used that power since that day.
When Max disappeared, Bart was taken in by Jay Garrick, the golden age Flash, and his wife Joan. Bart would continue his training with Jay and Wally and prove himself as an excellent hero. When Young Justice disbanded, Bart joined a new roster of Teen Titans along with Robin and Superboy.
Joining the Teen Titans and Becoming Kid Flash
Bart joined the Teen Titans shortly after the Young Justice team he was on dissolved. Early in his Teen Titan career Bart is shot in the knee cap by Slade Wilson, Deathstroke.
This put him out of action for a while but while he couldn't run he decided to read every book in the San Francisco library. When Bart fully recovered he returned to the teen titans he chose to shed his Impulse identity and become Kid Flash but he needed a prosthetic knee cap although this never seemed to hugely hamper him.
Bart Allen: The Flash
Bart spent four years in an alternate reality's Keystone City, with Max, Barry, Wally, and an alternate version of Jay Garrick. There, Superboy-Prime managed to escape from his prison, and the alternate Jay failed to stop him. All the speedsters came together to return to their dimension so they could warn everyone about Superboy-Prime. However, they knew that not even the fastest men alive could get there before the insane Boy of Steel. Barry suggested to Wally that he somehow absorb the entire Speed Force, but cautioned that it might kill him. Bart bravely volunteered, because Wally had his family to think of, and Barry was incapable of it because he was already dead.
Wally handed him the ring and Barry gave Bart his Flash suit, which would both help Bart survive his journey. Bart reappeared in Tokyo wearing his grandfather's costume. He later helped the heroes against the army of escaped super villains in the Battle of Metropolis. Bart then explained to the nearby Wonder Girl that his grandfather's uniform was the only thing that could survive the trip back from where he had been, and that he was the only one there "who could still run". Bart then unleashed his anger against Superboy-Prime for killing Conner Kent, pummeling him at super-speed and forcing Superboy to retreat from the battle. When the crisis was over, Bart explained to Jay that he had spent years in an unknown dimension where he grew older. Bart confirmed that the Speed Force was destroyed and that he had used up the residual speed locked in his body fighting in Metropolis. He gave Barry's costume to Jay and said that Jay was once again the fastest man alive.
After about a year pretending to be powerless, Bart eventually was forced to reveal that the Speed Force has been inside him all along in order to defeat a rogue pseudo-speedster, The Griffin. He became the Flash, and joined the Justice League. He also moved to Los Angeles and started at the L.A. Police Academy. During this time he dated Valerie Perez. Soon he was attacked by Inertia and the Rogues, who drained him of the Speed Force and beat him to death. Ironically, Wally West was returned to New Earth by the Justice League at almost the same time, sadly a little too late to help his protege. Bart is survived by West, his grandmother Iris and girlfriend Valerie.
Keystone city held a funeral for Bart. Jay Garrick, Cyborg, Wonder Girl and one of Bart’s best friends, Robin gave eulogies. At the end of his speech, Robin plays a video of Bart just after he became Kid Flash, in the video Bart says no matter what happens he will always be proud of being in the Flash legacy and on how happy being a Titian made him. After the Keystone funeral, the Teen Titans held a small private ceremony of there own, the Titans that were present at it were Robin (who spoke at the ceremony), Flash (Wally West),Supergirl, Wonder Girl, Cyborg, Starfire, Ravager, Kid Devil, Beast Boy, Raven and Miss Martian. A gold statue of Bart as Kid Flash was put up next to the Superboy statue.
Resurrection and Return to the Present
When the Legion of the 31st Century came back to the past, the Justice League thought that the return ofWally West was the culmination of their efforts, yet it was only a happy side-effect. Using his lightning rod, Brainiac 5 was able to capture the essence of Bart Allen. Returning to the future, he found his Legion beset by Superboy Prime and the Villains he had assembled to destroy them. After calling forth other Legions to help them from alternate Universes, Brainiac 5 prepared to implement the second of his three stages in his Psychological war against Prime.
Gathering all of the Lightning wielders of the 3 Legions in their headquarters he also gathered along with Bart's cousin XS, and Light Lass. He had XS ran along the Cosmic Treadmill, and while Light Lass used her power to keep her from becoming a singularity, and had the Lightning Twins hit her with their power. Bart found himself in the 31st Century along with his cousin and the members of the Legion. Taking the Flash Ring offered to him. Dressing himself, Kid Flash launched himself at Superboy Prime, ready to continue the fight.
As Black Rings descend upon the earth, Bart is seen at Heroes Day with the other titans. Bart tells Wonder Girl that he wishes they could take down the statues of the desceased Titans, wishing that they'd come back. Cassie then tells him to be careful what he wishes for, and then remarks that they have Kid Flash and Superboy back, so its a start. Later, as Black Lantern Terra attempts to destroy the tower, Bart and Cassie save Donna Troy, who was recently bitten by her child resurrected as a black lantern. As more Black Lanterns descend upon the Tower, Bart remarks in terror at the dead even managing to turn Garth into one of them. As he fights off Garth, Dove is cornered by her sister Hawk, turned Black Lantern. As the black lantern attempts to take Dove's heart, she emmits a large White Light, destroying all the Black Lanterns, except Garth, Terra and Hawk (Hank Hall).
Later, Bart tells Barry about what happened at Titans Tower. as he rushes to Barry's aid, Barry talks to Wally about talking to Solovar on stoping the undead assault. As Barry heads to Gorrila City, not knowing Solovar has returned as a black lantern as well, Bart and Wally are tasked with saving civilians, until Nekron ressurects Batman. The black lantern creates emotional tethers with the ones closest to him, turning them into Black Lanterns (Superman, Superboy, Green Arrow, Kid Flash, Wonder Woman, Ice and Animal Man). Black Rings then chase after Barry and Hal Jordan, only to be stopped after Barry runs two seconds into the future. Barry then receives a Blue Lantern ring, and sees Solovar and Professor Zoom catching up, and Bart receiving a Black Ring. Barry gets distracted by Ronnie Raymond, the previous Firestorm turned Black Lantern and fused with the current Firestorm (Jason Rusche). As Firestorm tries to stop Barry by destroying the road he and Wally running on, Barry creates a construct of Gehenna, The current Firestorms girlfriend that Ronnie murdered. The construct fills Jason with enough hope to attempt to escape Ronnie. As he's escaping, Bart attacks Barry. As the speedsters battle, Wally accidently vibrates through Bart. Wally sees Bart inside the ring, slowly dying and saying hes sorry. Wally is thrown out and tells Barry about what he saw. Barry vibrates through bart, and has a heart to heart with him, saying he never had much time to get to know his grandson, but hopes he has plenty of time to. Bart frees himself from the ring, and tells them that Nekron is calling all the Black Lanterns to Coast City.
Back with the Teen Titans
Following Blackest Night and his return to the 21st century, Bart has permanently re-taken the mantle of Kid Flash. When the Teen Titans are captured in Dakota and require back-up, Cyborg calls Kid Flash and Superboy out of retirement to rejoin the team once more. After the battle with Holocaust, Kid Flash officially rejoins the Teen Titans as he is with them on the T-Wing as they return to San Francisco to question a hostage. Things take a turn for the worse however when the hostage transforms into a mythical creature, destroys the T-Wing, and takes Raven through a dimensional rift. The team does battle with the magical enemy known as the Wyld and comes out of the skirmish unscathed, unlike the majority of his team members.
Since this line-up altering battle, Bart has remained a constant on the team and has shown that he is back with the Teen Titans for good. It is revealed that Bart has a lot of knowledge that he picked up while in the 31st century and is desperately attempting to jot it all down before it fleets his memory for good. Kid Flash and the rest of the Titans get embroiled with the surfacing of the Feral Boys, Dr. Caligan, and Headcase.
In his remaining time on the Teen Titans team, Bart battled many enemies such as the returning Superboy Prime and Calculator. He also met new heroes such as Solstice and Damian Wayne, the current Robin.
It has been revealed that Bart Allen will be a member of the Teen Titans in the DC relaunch.
After failing to save a burning building and making the situation worse, Bart disappears, where he is being researched into by Tim Drake, who is interested in starting the Teen Titans. Bart was captured and put in a cell by the organisation N.O.W.H.E.R.E., when he tried to escape from the building he met a fellow teenage meta human, Solstice.
Recently, Kid Flash discovered that he was shaking apart from injuries sustained after a battle with Superboy. The Teen Titans took him to Star Labs where Virgil Hawkins designed a costume for his which isolated his vibration issues.
It was recently revealed that one of Bart's fears is failing his friends, this was shown when the metahuman, Omen, attacked the Teen Titans and showed bart a hallucination where he tried to save his fellow teen titans, Bunker and Solstice, but ended up getting them both killed. It is not reveled yet that he is related to Barry Allen in the DC New 52 series as his grandson in the series.
Major Story Arcs
For More Information: Zero Hour
Bart helps the heroes of Earth during the events of Zero Hour. After the event when Wally is believed to have died Bart takes it quite badly.
For More Information: Infinite Crisis
During Infinite Crisis Bart was forced to fight Superboy Prime after he attacked the Teen Titans. Bart teamed with Jay and Wally to take him down. The three went all out to force Prime into the speed force. Prime was preparing to use his heat vision on the speedsters until the timely interception Jay provided by using his helmet to prevent the blast but Jay stumbled and went out of the race and Wally seemed to vanish leaving Bart alone to try and force Prime into the speed force that is until emanations of Barry Allen, Max Mercury and Johnny Quick, all of whom were former speedsters who had been taken into the Speed Force, appeared to assist Bart.
As a result Bart ended up being absorbed into the speed force himself. Stuck in the speed force with Wally and Barry, Barry says that they should pool their speed together so that one of them could get back and warn the world of Superboy Prime. Barry nominates Wally but Bart puts himself forward because Wally had a family and Barry was just a ghost. Bravely Bart races and gets to Metropolis just in time to help the other heroes fight against prime.
For More Information: Final Crisis Legion Of Three Worlds
During Final Crisis the Legion of Super Heroes bring Bart back to life in order to have him help them to stop Superboy Prime.
For More Information: Flash Rebirth
During Flash Rebirth Barry Allen returned. This gave Bart an opportunity he never had, the opportunity to meet his grandfather. It also brings back Bart's mentor and friend Max Mercury.
For More Information: Blackest Night
During Blackest Night Bart was turned into a black lantern due to the fact he was killed and came back. Black Lantern Bart attacks both Barry and Wally during these events but is reminded of who he is and Barry using his new blue lantern ring to break Bart's black ring freeing him from it's evil snare.
Road to Flashpoint
For More Information: Flashpoint
With Barry Allen back in the Central City Police Crime Lab, he doesn't seem to have time for his Flash family, exceptional Bart. And one day when Barry chooses to spend time on the murder of the Elongated Kid instead of going to a family picnic, Bart takes offense and goes to the Crime Lab to confront him. When he gets there he sees Barry chase after Hot Pursuit. Bart gives chase and when he catches up he sees Hot Pursuit reveal his identity to be Barry Allen from a parallel Earth, who came to Barry's earth chasing a time anomaly. Barry seems to be believing Hot Pursuit story but Bart is more skeptical. When Hot Pursuit learns that Bart is from the future he informs the pair of speedsters that Bart will feel time anomaly first.
After Hot Pursuit leaves Bart confronts Barry about missing the picnic and blames himself. Barry tries to explain that its not Bart that Barry is going though his own personal issues but Bart doesn't believe him and runs off. This prompts Iris Allen to stage and intervention for Barry, after Jay Garrick and Wally West say their peace about how Barry has been acting, Bart get furious and storms out. Barry chases after but Bart gets attacked by Hot Pursuit. Hot Pursuit believe Bart is the time anomaly and feels that Bart's death is the only way to stop the anomaly.
Hot Pursuit then realizes its not Bart, but its Professor Zoom. Bart, Hot Pursuit and Barry fallow Hot Pursuit's time stick to Zoom, who is attacking Patty Spivot. Bart and Barry try to stop him but Zoom kills Hot Pursuit and escapes. Barry then laters explains to Bart that it wasn't Bart he was avoiding it was everyone for fear that Zoom might come after them to get to him. Bart excepts this reason and the two bond over their loses.
For More Information: Kid Flash Lost
During the events of Flashpoint Bart finds himself in a virtual world, he shortly discovers it's not real and awakes to find himself in a pod. He finds that it was Brainiac who was behind it but he also find that his connection to the speed force has been severed. He is saved though by the timely intervention Hot pursuit,Patty Spivot, who had also been abducted by Brainiac. Brainiac claimed that the pair were "time anomalies" and that he abducted them as he wished to learn everything about space and time. The pair escape Brainiac only to learn that the future is a terrible place. Bart finds out he is in the year 3011, one thousand years after Flashpoint, and that Brainiac had taken over Earth five centuries ago and placed everybody in pods where they experience virtual reality. Bart and Patty realise they have to stop this from happening and the only way to do that was to get back the speed force power cell from Patty's speed force motorcycle. They break into Brainiac's skull ship and fight off Brainiac but in the ensuing battle Brainiac impales Patty but in her last act she releases the power contained in the speed force power cell. Bart quickly starts running and finds himself transported back to 1889 where he finds he has undergone a costume change which resembles that of Black Flash. He sees his friend and mentor Max Mercury but Max does not recognize him (as they haven't yet met). Bart warns Max to stay away from him but Max touches Bart and is suddenly struck down by a bolt of lightning. Bart is then once again flung through time and ends up in a lab where he finds Jay on the floor dead, he rushes to Jay's side only for Jay to be struck by a bolt of lightning also. Once more Bart is flung through time only to find himself in a grave yard before a tombstone dedicated to the late Wally West. Bart pounds the ground and he himself is struck by lightning only to find himself chasing his grandfather Barry. He then realises he was given this power so he could become the first White Flash. He then realises that he must give the speed he has absorbed from Max, Jay and Wally to Barry so that he could prevent the terrible future Bart witnessed from occurring.
Bart Allen is impulsive, he acts without thinking, to which Batman gave him the name 'impulse'. He's a typical kid, He loves to play games, eat chocolates, and play space games. Bart is also a lady charmer, it happens that he gets a lot of attention from girls, rather than charming them like Wally West. Bart is a good friend, He's a nice guy, funny, and he is very loyal and protective. He wants to help who ever he can. there is also a more serious side to Bart, he wants to be a good hero and a good person. He is very determined.
Powers & Abilities
Bart’s primary power is his super speed which he gets from tapping into the speed force. As Impulse and Kid Flash, Bart could achieve speeds greater that mach 10, but when he returned from the alternate dimension he could reach incredible Speeds, such as Light speed. Wally West has said that Bart was faster than all the speedsters put together. Bart can lend and borrow speed from other people, a good example of this is when Wally West fights Professor Zoom and Bart and Jay Garrick among other speedsters lend Wally their speed so he can bear zoom. Bart can move his limbs at such speeds that he can make vibration wave and manipulate his bio mass that he can appeared invisible. Bart can also run across water and up vertical surfaces such as walls. Bart can create vortexes by running and moving his limbs in a circular motion at high speeds.
As Impulse, Bart discovered that he had the ability to create clones of himself that he can send any where, the clones have a small amount of time away from Bart when they do return Bart absorbs their memories, however when one of his clones got killed, Bart felt the trauma of its death, Bart has never used the power since the incident.
Unlike other speedsters Bart has an photographic memory that lets him remember everything he has ever read, a good example of this is when he read every book in the San Francisco library in a couple of hours.
Before he died the Speed force had actually lived inside Bart, making them one in the same. Although it became very dangerous when Bart ever tapped in to speed force, Bart had to wear the flash suit while running to stop it from killing him. He would gain control over the speed force, however. Bart would have been the most powerful Flash ever but died before we saw any of the effects.
Also, the speed force also gave Bart a kind of aura that gave him immunity from friction and heat generation while running, the aura also gives Bart a small amount of invulnerability.
Thanks to his hyper-accelerated metabolism Bart can heal faster than normal humans. The injury, however, may not necessarily heal correctly.
Bart’s reflexes, stamina and agility are also at superhuman levels.
Bart is a good hand to hand fighter, thanks to his super speed he can land hundreds of powerful punches a second. Bart is also very knowledgeable thanks to his photographic memory. Bart has had hand to hand training from the LA Police department and Batman's pretege, Robin. He is also very knowledgeable in anatomy.
- Height: 5 feet 2 inches (157cm)
- Weight: 115lbs (52kg)
- Hair color: Auburn
- Eye color: Yellow
- Marital status: Dating, with Solstice
- Occupation: None
Titans of Tomorrow
In the Titans of Tomorrow story arc, Wally West is dead and Bart is the new Flash. The Titans are now a fascist team of superheroes who control the world and enforce a zero tolerance life style for the people. Bart is part of this team but is having an affair with Rose Wilson who is on a freedom fighter team, Titans East. Bart is found out by Batman (Tim Drake) and takes a bad beating, he helps the Teen Titans escape back to there time. Due to Barts and Superboy's deaths, this future changed slightly. The versions of Bart and Superboy in this future are actually clones of the originals, created after years of trying by Tim Drake. Unlike the flash in the first part of Titans of Tomorrow, Bart is completely loyal to Batman's Titans.
After the death of Max Mercury and Helen Claiborne, Bart and his girlfriend, Carol Bucklen, travel back to future to be with Bart's mother. Carol begins to study the source of Bart's powers, the speed force, to benefit the human race. But Bart's grandfather, President Thawne, uses Carol's research to strengthen his army and make it stronger. He makes Super speed soldiers. An adult Carol and Bart manage to pull their younger selves (main-stream Bart and Carol) into the future. When they return to their time, Bart prevents Max's and Helen's deaths to stop this future from ever happening.
In Other Media
Television and Board Games
Bart Allen appears in the television series Smallville. He first appeared in the episode "Run". His name is Bart Allen but Clark finds 3 fake I.D.'s of Bart's with different names; "Jay Garrick", "Barry Allen" and "Wally West". Bart leaves and tells Clark he is going to search the world for others like Clark and himself.
He is seen later in the episode "Justice" working with Green Arrow, this time wearing a proper costume.
In 2002 a game called Heroclixs was made Bat Allen was made in the series and he has a power card in the series pack called Justice League in 2007 and in 2013 after the events when DC Comics relanched in the New 52 series called Teen Titans we see Kid Flash with his coustume on and his power card and his comic book series the he appered in. The Flash Family is made in the series they would be a good team to fight off anyone in the game series.
Legion of Super-Heroes
Bart once appeared in a comic book adaptation of the Legion Of Super-heroes Animated Series when the two Legionnares, lighting Lad and Bouncing Boy, were trapped in a virtual reality machine Bart helped them to escape.
Young Justice: Invasion
Bart appeared in episode 6, Bloodlines as Impulse, and acted as a 'tourist' to travel in the past.When Bart first arrived in the cave he met Robin (Tim Drake), Nightwing and Beast Boy. He caused mayhem in the cave and revealed Nightwing and Robin's real names but was stopped by Nightwing who took a sample of his DNA and made Bart swallow a tracer. Bart escaped from the cave and found his way to Central City. Bart burst into Barry and Iris' house during a party celebrating Jay and Joan Garrick's 70th wedding anniversary he revealed to Barry that Iris was pregnant and then shocked the couple by accidentally revealing that they were going to have twins. The speedsters were told that there was a villian named Neutron, Barry and Bart raced to where the villian was attacking. There, he helped Flash (Barry Allen) and Kid Flash (Wally West) to defeat Neutron (Nathaniel Tryon). Barry attempted to grab Neutron and take him to the desert to minimize the damage caused by Neutron when he released a powerful blast of energy. Bart accidentally made Barry trip and land on the ground, Bart and Barry were then saved by Wally and Jay Garrick.
Wally accused Bart of almost getting the Flash killed but Barry told Wally that Bart actually saved him because he would never have been able to take Neutron to the desert in time.
Later back at the cave, after Bart was proved to be truly from the future, he attempted to use the machine he came in and go back. But the time travel machine didn't work, so he was stuck in the past.
It was later revealed at the end of the episode, that Bart knew that using his time travel machine was a one way trip. But he did so to escape the dreary state of Mount Justice in 40 years time. He also appeared to have made a deal with Nathaniel to help him alter his past self back into human form so he wouldn't have to suffer in the future.
Bart was shown to not be from the 31st century as he was in the comics but instead from 40 years in the future. This means that Barry and Iris did not have their children in the future.
Bart is currently staying with Jay and Joan Garrick, it's not been said if he will permanently join the team.
In this episode of Young Justice Bart uses phrases like "Crash" instead of good or cool and "Mode" instead of bad.