It Conquered the World is an independently made 1956 American black & white science fiction film, produced and directed by Roger Corman, starring Peter Graves, Lee Van Cleef, Beverly Garland, and Sally Fraser. It Conquered the World was released theatrically by American International Pictures as a double feature with The She-Creature.

It Conquered the World concerns an alien creature from the planet Venus that secretly wants to take control of the Earth. The creature makes radio contact with a disillusioned human scientist, who agrees to help because the scientist believes such an alien intervention will bring peace and save a doomed humanity from itself.

Cast
Peter Graves as Dr. Paul Nelson
Lee Van Cleef as Dr. Tom Anderson
Beverly Garland as Claire Anderson
Sally Fraser as Joan Nelson
Russ Bender as General James Pattick
Taggart Casey as Sheriff N.J. Shallert
Karen Kadler as Dr. Ellen Peters
Dick Miller as Sgt. Neil
Jonathan Haze as Corporal Manuel Ortiz
Paul Harbor as Dr. Floyd Mason
Charles B. Griffith as Dr. Pete Shelton
Thomas E. Jackson as George Haskell
Marshall Bradford as Secretary Platt
David McMahon as General Carpenter
Paul Blaisdell as The Monster (uncredited)

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