Mark 13 is a government-built killing machine programmed with artificial intelligence, able to repair and recharge itself from any energy source. Through a series of coincidences, the cyborg's head ends up in the home of a sculptress as a bizarre Christmas present from her boyfriend. Once inside its new home, the cyborg promptly reconstructs the rest of its body using a variety of household utensils and proceeds to go on a murderous rampage.

A lady who thought she had found the missing love in her life becomes involved in a series of murders involving those she once loved.