Tri Cyclopsin salaisuus was released in the year 1940。Tri Cyclopsin salaisuus is also called as Dr. Cyclops, Dr. Zyklop, Dr Cyclops, Dottor Cyclops, Doctor Cyclops, Doctor Cíclope。

Four explorers are summoned to Peru by the brilliant physicist Dr Thorkel. They discover a rich source of radium and a half-mad Thorkel who shrinks them down to one-fifth their normal size when they threaten to stop his unorthodox experimentation.