A police officer, Sgt. Grimaldi, is killed and mutilated in an alley by Akro the zombie, and his severed head is mailed in a box to a horrified Sgt. Cross. Susan Vanard is kidnapped by the zombie and taken to Dr. Corey's lab, where he injects her with a serum that ages people prematurely and turns them into zombies. As Susan is rapidly transformed into a shriveled mummy, Sgt. Cross finds Dr. Corey's lab just in time. Akro the zombie turns on Dr. Corey when he overhears him say that Akro's body is wearing out and that he'll be dead soon. He strangles Dr. Corey in a rage, and then dies when he can no longer obtain his life-preserving elixir. In the final scene, Susan is able to drink an antidote that returns her to her normal state.