International spy Jason Starr disappears following an altercation while on a mission. His boss seeks out Jason's twin brother, veterinarian Warren Starbinder, and asks him to pose as Jason in order to complete his mission.

When a man is exposed to an alien gas, he acquires the ability to heal instantly and survive any injury or toxin.

Donna is married to a workaholic who travels frequently for his job. When he takes a long term assignment overseas, Donna feels abandoned and turns to her daughter’s schoolteacher for companionship. She is unaware that he is a dangerous murderer and thief who preys on lonely married women. When her husband returns she is forced to deal with her betrayal and bring him to justice.