Tristram Coffin as Jeff King

Mae Clarke as Glenda Thomas

Don Haggerty as Tony Dirken

James Craven as Prof. Millard

I. Stanford Jolley as Prof. Bryant

House Peters Jr. as Burt Winslow

Douglas Evans as Chairman

Ted Adams as Martin Conway

Stanley Price as Gunther Von Strum

Dale Van Sickel as Martin/Professor Drake/Gates

Tom Steele as Knox/Taxi Driver

David Sharpe as Blears/Cliff/Stark

Eddie Parker as Rowan

Buddy Roosevelt as Philips

Marshall Bradford as Professor Graftner

Arvon Dale as Chairman’s Aide

Art Gilmore as Newscaster

Bert LeBaron as Morgan

Carey Loftin as Sparks

Jack O'Shea as Walter

Bud Wolfe as Clay

Frank O'Connor as Warehouse Guard