Asher Mahonin

Sarge is in charge of the RRTS, he is also calm and collected but is a demanding leader.

SPOILER WARNING: Plot details follow.

Sarge led the RRTS on Mars when he received a distress call from the UAC and ordered his men to get to Mars, once they arrive, and they encounter their first monster, Sarge starts to become a bit more tense, and he increasingly gets more demanding after he get gets infected by a monster with the artificial 24th chromosome which slowly infects his blood stream. He begins ordering his men to kill every single remaining Human on Mars Base so the virus does not spread to Earth, and after The Kid informs Sarge that he spared some people he found, Sarge violently murders The Kid and is shortly after kidnapped by a mutants and dragged away, yelling at Reaper, telling him how he wasn't meant to die. Sarge presumably managed to kill the mutants that dragged him away and escape, showing up later in the film.

After Reaper gets away, Samantha injects the 24th chromosome into him, but instead of turning him into a mutant, he gets super-Human strength and maintains his mental stability. Reaper goes on the offensive and kills every single mutant on the base and shortly after encounters Sarge afterwards. Sarge, at least appearance wise, has not changed yet but at this point his strength has gotten far superior and sanity almost gone. Sarge tells Reaper how he killed the women and children and the Kid. He asks how much ammo Reaper has left and then fires his BFG at Reaper, who dodges the shot. Sarge starts to grow horns and melee fights with Reaper. After an intense battle, Reaper throws Sarge into the teleport and Reaper throws a grenade through the portal. Sarge is killed by the blast.