Dreaded serial killer Peter Kurten voluntarily turns himself over to the authorities. A young lawyer, eager to prove Kurten's mental derangement, agrees to defend a man who terrorized Germany between 1929 and 1931. In studying the case and meeting with the intelligent, cold-blooded manipulator, the young idealist's values become warped.

A team of space marines known as the Rapid Response Tactical Squad, led by Sarge, is sent to a science facility on Mars after somebody reports a security breach. There, they learn that the alert came after a test subject, a mass murderer purposefully injected with alien DNA, broke free and began killing people. Dr. Grimm, who is related to team member Reaper, informs them all that the chromosome can mutate humans into monsters -- and is highly infectious.