Richard Bailey as Lance Reardon

Linda Stirling as Claire Forrest

Roy Barcroft as Capt. Mephisto

Kenne Duncan as Sidney Brand

Forrest Taylor as Prof. William Forrest

Forbes Murray as Prof. Harry Hargraves

Jack Ingram as Edward Armstrong

Harry Strang as Frederick "Fred" Braley

Ed Cassidy as Paul Melton

Frank Alten as John Raymond

Lane Chandler as Police Insp. Reed

Russ Vincent as Ruga

Dale Van Sickel as Barker / Ritter / Lewis / Frazier / Sardon

Tom Steele as Lyons / Bailey

Duke Green as Spencer Harvey