Mohinder took on his father's work to discover the truth about individuals with superhuman abilities.
Genesis
In the first season, Mohinder is the only human main character (until Mr. Bennet is later cast as a main character). He travels to New York to gather his fathers belongings after he was killed in a "car crash" while driving his taxi.
Mohinder's father, Chandra went to New York to try and prove his theory of evolved evolution. At first Mohinder believes he's crazy, but after his father is killed, and he claims his research, Mohinder decides to carry on with it.
He takes up his fathers job and begins renting his fathers appartment, be-friending his neighbour, Eden McCain. Eden is later revealed to be working for HRG, and her task is to get Claire Bennet's name of Chandra, now Mohinder's list.
During this time, Peter Petrelli comes to Mohinder, beleiving that he can fly and telling him that Issac Mendez can paint the future. But after Peter is visited by future, and after Peter tells Mohinder about it, Mohinder believes it's a fools errand and returns to India.
There he discovers that he did have an older sister, Shanti who died shortly after he was born. His sisters name is the password for his fathers computer, containing the list. This was all revealed to Mohinder by a young boy by the name of Sanjog Lyer, who has the ability of dream manipulation. Sanjog also helped him discover that his father was killed by Sylar.
Mohinder returns to New York, and goes after Nathan, explaining that he and his brothers have powers. When Nathan comes to visit him later, he tells him that Peter is like a sponge.
Shorlty after, Eden calls Mohinder explaining that she wasn't who he thought she was. A while later, he learns of her suicide.
Mohinder then begins a quest across the U.S. to find people with these special abilities. On his first visit to a man named Zane Taylor with the power of liquidfication, Mohinder is conned by Sylar whose impersonating Zane, to take "Zane" with him on his quest.
They next visit Dale Smither, and Sylar kills her and steals her power, but convinces Mohinder just to run otherwise they'd look suspicious. When the two return to New York, Mohinder discovers who Sylar is, and drugs him and torchers him. However, Sylar breaks free and pins Mohinder to the ceiling. Luckily for him, Peter arrives and saves him, and Mohinder in turn saves Peter, by taking his body to the Petrelli mansion where Claire pulled the shard of glass from his head, allowing him to heal.
Thompson then arrives at Mohinder's appartment, telling him to come and work with them. At first Mohinder declines, but after he learns that Molly Walker is ill with what looks like the Shanti Virus. Mohinder manages to heal her, and stops H.R.G. from taking her life. While Matt Parkman and H.R.G. go to find Sylar, Mohinder escapes Kirby Plaza with Molly. On the way they find D.L. wounded, and Mohinder stiches him up. Mohinder and Molly are last seen in season 1 looking at Matt as he's carried away in an ambulance.
Generations
Mohinder has now gone back to lecturing people about these people with powers. This is actually revealed to be a plan by him and H.R.G. to take down the Company, as he joins them in the first episode.
He is actually know one of Molly Walker's carers along with Matt Parkman and they're all living in New York.
Mohinder's first mission is to cure the Haitian of the Shanti Virus, which he does, and secretly sends him to H.R.G. pretending the Haitian wiped his memory. When Molly is put in a coma by Maury Parkman, despite the warning of H.R.G. Mohinder takes her into the Company.
Mohinder is given a new lab to, Issac Mendez's old loft. The place has been rigged with surveillance cameras, Bob telling Mohinder it's for the best.
After tasering Niki Sanders after she tried to strangle Bob, Mohinder goes to visit Monica Dawson, who has the ability of "adoptive muscle memory". Bob tells Mohinder to test a new strain of the Shanti Virus on Monica without her knowing, but is unable to go through with it and throws a stool at a cabinet full of viles holding the Shanti Virus.
When Niki attacked earlier, Mohinder recognized her instantly and tries to free her, but she says she's there volunterily. She's then revealed to be Mohinder's new partner. When Maury Parkman attacks a Company facility, Niki and Mohinder team up with Matt and Nathan to take him down. Mohinder is then punched in the nose by a tormented Niki. At the end of this episode, it is revealed that Mohinder's blood is no longer a cure for the new strain of the Shanti Virus. Mohinder then betrays H.R.G. to Bob because he wants to cure Niki, and Bob reveals that the cure lies within Claire Bennet's blood. Mohinder is then issued a Company gun.
Mohinder is then given a new partner, Elle Bishop. Mohinder tries to trick H.R.G. but messes it up. He tries to negotiate with him but is unable too. West is able to knock Elle out and H.R.G. beats up Mohinder, and the two take Elle. During the trade, Claire for Elle, Mohinder is forced to shoot H.R.G. in the eye, but Mohinder revives him with Claire's blood that Bob took.
Mohinder calls Niki saying he has the cure and he's heading to New Orleans. But after he puts the phone down he gets a call from Sylar, who says he's waiting with a friend for him, and that they have Molly.
Mohinder rushes back to New York, and barges in on Sylar and Maya who's making breakfast. Mohinder quickly convinces Maya that Sylar is a killer, but Sylar pulls a gun on them, and makes Mohinder take him, Maya and Molly to his lab.
Luckily for Mohinder, as Bob told him earlier, there are security cameras in his lab. Luckily Elle is watching and rushes to their aid. Before Elle arrives, Mohinder diagnoses Sylar with the Shanti Virus, telling him that's why his powers aren't working. Sylar then shoots Maya, who attempted to confront him about killing her twin brother. Sylar makes Mohinder use the cure on her first, so he can see that it works. After he does, Sylar takes the case and Elle suddenly attacks, making Sylar flee. Elle believes that her father (Bob) will kill her for letting him escape, but Mohinder tells her that she saved them as Sylar was probably going to kill them, to which she replies "Cool".
Season 3
in season 3 of heroes Mohinder discovers a formula thanks to Maya Herrera and her powers, that can give anyone powers from a single syringe. He of course tests it on his self and passes out
