On the Threshold of Space

Guy Madison

Capt. Jim Hollenbeck

Virginia Leith

Pat Lange

Dean Jagger

Dr. Hugo Thornton

John Hodiak

Maj. Ward Thomas

Martin Milner

Lt. Mort Glenn

Warren Stevens

Capt. Mike Bentley

King Calder

Lee Welch

Walter Coy

Lt. Col. Dick Masters

Ken Clark

Sgt. Ike Forbes