After inadvertently ingesting some sugar laced with LSD, a man wakes up with amnesia and in the middle of a murder plot.

A psychiatrist investigates the death of one of his patients, a young heiress.

Hercules (Gordon Scott) sets out to save the city of Troy from a horrible sea monster. Meanwhile, the city is threatened by a different kind of monster--a smarmy politician who will stop at nothing to seize the throne.