A scientific facility on Mars receives a visit from the Rapid Response Tactical Squad, a group of space warriors under the command of Sarge, when someone reports a security violation. They discover that the test subject, a mass killer who had been deliberately implanted with extraterrestrial DNA, got out and started killing people as the alarm was received. Dr. Grimm, a relative of team member Reaper, warns them all that the chromosome is extremely contagious and has the power to turn people into monsters.