Caliban

During the Mutant Massacre Caliban and  Leech were attacked by Sabretooth.  They managed to escape his attacks by hiding inside locked tunnels, and were later rescued & taken in by the original X-Factor.  Caliban enjoyed living above the streets for a change, and became an essential part of X-Factor when he could locate mutants in danger, such as Rictor who had been taken prisoner by The Right.  However, he was emotionally effected by the Marauders' attack, and after being easily defeated and taunted by the Right's foot soldiers.  Therefore after  Apocalypse had transformed Angel into Archangel, the horseman of Death, Caliban betrayed his friends and offered himself to Apocalypse.

For a while Caliban was known as Hellhound, but was later officially pronounced as Death; Archangel's replacement in Apocalypse's Horsemen. He would use his enhanced senses and strength to locate more mutants for Apocalypse, and his personal anger & rage to punish his enemies.  However, after Apolcaypse was defeated on the moon by the combined forces of X-Factor and the Inhumans, Caliban returned to Earth and began his hunt for Sabretooth, who had returned to the Morlock tunnels to kill any remaining Morlocks.  As Sabretooth hunted the remaining Morlocks, Caliban hunted him.  Caliban was unaware of Sabretooth's healing factor, so when he broke Sabretooth's back & left him for dead, he had unwittingly spared him his life.  

Soon afterwards, Caliban confronted Archangel, who had rejoined his team-mates in X-Factor.  As they had both been genetically altered by Apocalyse, Caliban saw it as an opportunity to prove his superiority over his predecessor.  He defeated Archangel, and  Sabretooth for a second time.

It was at the start of the X-Cutioner's Song when Caliban ambushed  Jean Grey & Cyclops as they sat discussing their relationship in Harry's Hideaway.  Although they were both incredibly powerful mutants, neither could stop Caliban's emotionally charged attack.  Nothing could stop Caliban's attack on his former X-Factor team-mates, and by the time Iceman and Colossus had defeated the horsemen War and Famine, Caliban had kidnapped by Scott and Jean.  However, instead of returning them to Apocalypse, they were eventually delivered to Mr Sinister.

After a few years Caliban broke free from Apocalypse's control, and he no longer went under the name of Death.  His mental state appeared to regress to a childlike and simplistic state.  He kidnapped Jubilee and offered to return her to the X-Men safely in exchange for the Sabretooth.  The transaction was initially smooth, but during the fight between Caliban and Sabretooth was savage.  Caliban was forced to let Sabretooth flee after his face had been mauled.

Without Apocalypse's control, Caliban returned to being an ally of the X-Men.  When X-Force returned to the Mansion to strengthen their connection with the X-Men, Cable invited Caliban to join the team.  He quickly became an accepted member of the team and developed strong friendships with Sunspot and Warpath.  His simplistic observations were often accurate although sometimes over-looked by his team-mates, but he enjoyed the banter with his new friends.  

Despite Caliban's childlike state of mind, he was still prone to savage ferocity.  At that time Sabretooth was also living in the mansion after Wolverine had pierced his brain with one of his Adamantium claws.  Also appearing to be childlike, Sabretooth was imprisoned in the Danger Room with holographic projections of fields and jungles to keep him amused.  One morning Caliban was discovered severely mauling Sabretooth, who was unable to fight back.  Cable managed to confused Caliban long enough to stop fighting by changing the holographic environment to reproduce the Morlock tunnels.  Later, when the rest of the team tried to prevent Boomer from visiting Sabretooth any more, it was Caliban who reasoned with her that Sabretooth had murdered many of his Morlock friends.  He implored her by saying Sabretooth was by his nature a savage monster, not to be trusted and would ultimately hurt her.  However, with his simple mind Caliban could not argue his case when Boomer turned the tables on him by reminding him of how he had also been a savage killing monster who had been redeemed.

While the rest of the world's heroes were battling Onslaught, Caliban and X-Force remained in hiding to protect the Age of Apocalypse survivor X-Man.  Caliban's mutant powers told him that this man was both the same as Cable yet different, but his mind could not comprehend why.  They intended to keep Nate Grey safe from Onslaught, however it was Mr Sinister who found them.  Sinister claimed Nate Grey as his property, as he had lost Nathan Christopher Summers who had been tainted as a baby by Apocalypse's Techno-Organic Virus.  The combined forces of X-Force and X-Man failed against Mr Sinister, however Caliban alone remained strong enough to confront Sinister.  During his physical augmentation Apocalypse had programmed Caliban to attack Sinister.  Although Sinister recognised Apocalypse's handiwork, Caliban's ferocity and raw power were unstoppable.  Single-handedly he had defeated Mr Sinister and saved Nate Grey.

During a psychic attack from Onslaught, a child who represented Charles Xavier's innocence sought to save the team by psychically moving them in and out of each other's unconscious minds.  Caliban was found enjoying life as an alien boy growing up on the farm with Cable and Domino as his parents, in a reflection of the 1978 Superman film.  Another surprise discovery the team made was that Caliban was exceptionally gifted at playing the piano,  but during moments of heightened intellect like this Caliban would experience crippling seizures.  His beautiful performance was cut short when he screamed out in pain and collapsed unconscious.  Although worried for their friend, no-one was aware of the fact that Apocalypse was tightening his grip on Caliban once more & had sent Ozymandias out to collect him.  While the rest of the team were fighting Operation: Zero Tolerance's Prime Sentinels and the Mutant Liberation Front, Ozymandias telepathically brain-washed Cable into thinking that he had left Caliban in safe hands.

Caliban's time with X-Force ended and Apocalypse transformed him yet again.  By installing him with the telepathic ability to spread disease, Apocalypse recreated Caliban as  Pestilence .  This time the other three horsemen were not weak mutants to augment.  Instead Apocalypse had transformed  Ahab ,  Deathbird  and Wolverine was the new horseman of Death.  Caliban was bitter and angry, and when he fought with his former allies he dismiss his friendship with those in X-Force.  Apocalypse merged himself with Cyclops, but Caliban was able to track down the combined creature.  Cable was finally able to defeat Apocalypse, and subsequently Caliban was once more set free, and yet again returned to his childlike personality.  

When the 198 were released from the grounds of the Xavier Institute, Caliban returned to the sewers with Leech.  The remnants of the Morlocks were attacked by Masque and his new team.  When Caliban tried to protect those weaker than himself, Masque used his powers to severely disfigure Caliban.  Removed of most of his strength and body mass, Caliban managed to crawl back to the Xavier Institute.  There, the sentinel guards identified Caliban and were given orders to take him into custardy so the ONE could use his mutant tracking abilities.  However, thanks to Storm's intervention he was taken into the care of the X-Men.  Recuperating, played on the  Human Torch's X-Box, but broke it's controller out of frustration while losing at the game.  He returned to the Morlock tunnels with Hepzibah, Storm and Warpath in order to help them defeat Masque.

Death & Enslaved Resurrection

Caliban began to work with his allies, and became a founding member of the new X-Force.  Together with Hepzibah, Warpath, Wolfsbane, Wolverine and X-23, Caliban went on the search for the first Baby Mutant to have been born since the Decimation of several thousand mutants' powers.  The team confronted Lady Deathstrike and her Reavers in battle.  A stray soldier had taken aim at Warpath and was ready to shoot him in the back.  However, Caliban saved Warpath's life by jumping in the line of fire.  The intention to kill Warpath had failed, but sadly took Caliban's life instead.  His self-sacrifice deeply effected his old team-mate.  Warpath buried his old friend back with the rest of his tribe on the Camp Verde Reservation and swore to avenge his friend by killing the Purifiers.  

However, Caliban's body has since been exhumed and re-animated.  Using the transmode virus obtained from the technarch Magus, Eli Bard essentially resurrected Caliban to use his mutant tracking powers.  Even after death Caliban's original mutant power are a valuable tool for X-Force's enemy, Selene so she can hunt down more mutants and digest their powerful life-force energies that would help extend her life.

Powers

Caliban was originally a mutant with the ability to sense other mutants within a 25 mile radius of himself.  This could be specific enough to locate individual mutants, what their abilities were and often identify mutants he had already encountered.  He also suffered from a physical mutation which forced him to flee human society.  He was bald, with alabaster white skin and large round yellow eyes.

After Apocalypse's transformation Caliban was physically larger and stronger with savage claws.  His strength would increase to superhuman levels as his adrenaline increased.  He could also absorb fear-generated psionic energy from others and redirect that energy back at them.

Alternate Versions

Age of Apocalypse (Earth-295)

Working with Domino , Caliban was assigned to track down X-Man . Although he did not have the muscular strength-enhancing augmentations of Apocalypse, it is highly likely that he had undergone other forms of enhancements from Dark Beast or Mr Sinister.  Unlike his mainstream counterpart, this version of Caliban is not Childlike.  He is well read, and often quotes from literature.  Despite being a bounty-hunter, he is essentially a coward leaving his associates to perform any violent deeds.  He was later killed by Toad .

House of M (Earth-58163)

Caliban was the member of the Marauders, the Genoshan Black Ops.

Ultimate Universe (Earth-1610)

Ultimate Caliban