

Earthmen on a fabulous, peril-journey into outer space!
Starship C57D travels to planet Altair 4 in search of the crew of spaceship "Bellerophon," a scientific expedition that has been missing for twenty years. They find themselves unwelcome by the expedition's lone survivor and warned of destruction by an invisible force if they don't turn back immediately.
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Earl Holliman
Cookie

Richard Anderson
Chief Engineer Quinn

George D. Wallace
Bosun

Robert Dix
Crewman Grey

Jimmy Thompson
Crewman Youngerford

James Drury
Crewman Strong
Harry Harvey Jr.
Crewman Randall
Roger McGee
Crewman Lindstrom

Peter Miller
Crewman Moran

Morgan Jones
Crewman Nichols
Richard Grant
Crewman Silvers

James Best
Crewman (uncredited)

William Boyett
Crewman (uncredited)

Les Tremayne
Narrator (voice) (uncredited)

Frankie Darro
Robby the Robot (interior) (uncredited)

Marvin Miller
Robby the Robot (voice) (uncredited)

Robby the Robot
Robby the Robot
Official Clip - New dress
Clip · YouTube
Official Arrow Trailer
Trailer · YouTube
Original Trailer
Trailer · YouTube
Commander John J. Adams and His Crew Land on Altair IV (Clip)
Clip · YouTube
Official Trailer
Trailer · YouTube
Invisible Monster Attack
Clip · YouTube