Riders to the Stars

Dr. Richard Stanton

Dr. Don Stanton

Dr. Jerry Lockwood

Dr. Jane Flynn

Susan Manners

Walter Gordon

Dr. Delmar

Dr. Paul Dryden

Dr. Frank Werner

Dr. Klinger

David Wells

Dr. Sidney K. Fuller (as James K. Best)

Research Laboratory Manager (uncredited)

Susan's Photographer (uncredited)

Archibald Guiness (uncredited)

This is the second of three films in producer Ivan Tors' "OSI" series. The scientists are taken to the "Snake Mountain Proving Grounds, operated by the Office of Scientific Investigation," according to Dr. Dryden. Dr. Stanton's desk nameplate indicates he is "Chief of Investigations."

The film features actors who appeared in Ivan Tors' other "OSI" films, Gog and The Magnetic Monster. These included Richard Carlson, King Donovan, Herbert Marshall and Michael Fox; however the actors played different characters in each film.

Actually, when the scientists arrive, they are told that the base is operated by OSI. Also, the jeeps seen at the beginning have OSI stenciled on the hoods.

The scene in which the astronaut is expelled from his spaceship and instantly turns into a skeleton is scientifically incorrect. The vacuum of outer space would instantly kill not only a human being, but also the microorganisms within the human body that cause it to decay after death. Therefore, a victim of this type of accident would look exactly as he did in life and be preserved indefinitely.

When Dr. Delmar calls for a voice check from each of the pilots just before the rockets take off, their names - "Gordon - Lockwood - Stanton" are heard coming over the radio in response. But it is plain that all three replies are being voiced by actor/director Richard Carlson (who plays Lockwood).

One of the astronaut candidates is being evaluated in a centrifuge by medical personnel. An X-ray of his chest showing his heart is reversed left to right. Also, a technician announces that the candidate's body temperature is 135, which is obviously incompatible with life.

Dr. Jerry Lockwood: [to Susan Manners] I've only got 20-20 vision for you.