Darwin worked as a taxi driver. While in this capacity, Professor X and Magneto asked him to join their CIA-sponsored mutant group. Darwin met his teammates, displayed his powers, and partied with them.
Following the Hellfire Club's assault on the Division X facility, Sebastian Shaw attempted to recruit the young mutants into his ranks. Angel Salvadore joined in, while Havok and Darwin tried to stop her. It was during this attempt that Shaw absorbed Havok's energy blast and placed it within Darwin. He tried to use his powers to survive from the blast that is within his body, but couldn't do so. Alex watches as Darwin puts his Arm out in front of Alex, as a gesture of respect to him before he explodes.
Erik and Xavier come back to find MiB HQ wrecked. When Xavier wants the kids to go home, Raven and Alex tell him that Shaw killed Darwin, with Raven adding up that " we can't bury him". Erik however says that they should avenge Darwin.
Reactive Evolution - Darwin was able to adapt his body to allow himself to survive. He demonstrated various aspects of this ability, including growing gills when submerged in water, turn into iron when under high degree of heat, or growing thick body armor when attacked.