Bela Lugosi as Dr. Alex Zorka / Dr. Zane

Robert Kent as Capt. Bob West

Dorothy Arnold as Jean Drew

Edwin Stanley as Dr. Fred Mallory

Regis Toomey as Lt. Jim Daly

Jack C. Smith as Monk

Edward Van Sloan as Jarvis

Dora Clement as Ann Zorka

Anthony Averill as Rankin

Hugh Huntley as Perkins

Monte Vandergrift as Al

Frank Mayo as Train Engineer

Jim Farley as Skipper

Eddie Acuff as Mac

Reed Howes as Signalman

Ed Wolff as The Robot

Hooper Atchley as Experimental Lab Tech

Roy Barcroft as AMI Agent Parker

Robert Blair as Smith

Al Bridge as White Rose Sailor

Don Brodie as Thug

Lane Chandler as Henchman with Rankin

Edmund Cobb as Army Sergeant

Lee J. Cobb as Road Crew Foreman (archive footage)

Eddie Dunn as Policeman

Jerry Frank as Henchman with Rankin

Karl Hackett as Brown

Charles King as Cop

George Magrill as Thug-Pilot / Schooner Crewman

Monte Montague as Airplane Mechanic

Pat O'Malley as AMI Chief

David Sharpe as Schooner Sailor

Tom Steele as Train Conductor / Radio Truck Driver

Forrest Taylor as Black

Harry Wilson as Schooner Crewman