Claude Rains

as Professor Benson

Bill Carter

as Cmdr. Robert Cole

Maya Brent

as Eve Barnett

Umberto Orsini

as Dr. Fred Steele

Jacqueline Derval

as Mrs. Collins

Carol Danell

as Cathy Cole

John Stacy

as Dr. Cornfield

Jim Dolen

as Boyd

Carlo D'Angelo

as General Varreck

Massimo Righi

as Lewis Boyd

Joe Pollini

as Pat

John Karlsen

as Supervising Commissioner

Renzo Palmer

as Barrington

Aldo D'Ambrosio

as United Commission Member

Giuliano Gemma

as Moran