Dick Miller as Dave Boyer

Susan Cabot as Sybil Carrington

Richard Devon as Dr. Pol Van Ponder

Robert Shayne as Cole Hotchkiss

Michael Fox as Jason ibn Akad

Eric Sinclair as Dr. Howard Lazar

Jered Barclay as John Compo

John Brinkley as Brunet Helmsman of Satellite

Tony Miller as Blond Helmsman of Satellite

Bruno VeSota as Mr. LeMoine

Jay Sayer as Jay

Mitzi McCall as Mitzi

Roy Gordon as The President

Beach Dickerson as Crewman with Gun

Jim Knight as Reporter

Roger Corman as Ground Control (uncredited)

James Gonzalez as Technician (uncredited)

Pat Clement as Reporter (uncredited)

Norman Stevans as Reporter (uncredited)