While working on a secret government project, a scientist's experiment goes very wrong. The mistake is costly as it leaves the scientist half ape and half human. He then steals a visiting flying saucer, which threatens to start an interplanetary war. Plastic Man gets the call to try and save the day.
Plastic Man is vacationing in Europe when he discovers that the evil Dr. Superstein is causing problems for local villagers. Dr. Superstein is using a statue that he built to give life to his latest crew of monsters he has created. Once alive the monsters begin searching the villages for exceptionally smart brains for his next project. It is now up to Plastic Man to stop them.