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.

Top Cast

Albert DekkerDr. Alexander Thorkel

Thomas ColeyBill Stockton

Janice LoganDr. Mary Robinson

Charles HaltonDr. Rupert Bulfinch

Victor KilianSteve Baker

Frank YaconelliPedro

Paul FixDr. Mendoza

Frank ReicherProf. Kendall