Huge creatures threaten the future of the human race in this monstrous double-feature.

THE MONSTER THAT CHALLENGED THE WORLD: A small earthquake awakens monsters in the depths of the Salton Sea which triggers the giant snail-like creatures to begin to multiply. Now, it is up to the Navy to try to stop these deadly mollusks as they migrate down the California waterways in search of more humans to devour.

IT! THE TERROR FROM BEYOND SPACE: After the first mission to Mars fails, a second ship is sent to pick up the survivors. However, only one man is left, and it appears he murdered the rest of the crew! When the space ship returns to Earth, the crew discovers a most unwelcome stow away--a living, breathing, hunting, killing creature! This low budget favorite has been sited as one of the inspirations for ALIEN (1979).

Tim Holt: American Actor/Jack's Son
Audrey Dalton: Actress/In USA
Hans Conried: American Comic Actor
Barbara Darrow: Actress
Max Showalter: American Actor
Harlan Warde: Actor
Gordon Jones: American TV/Film Actor
Mimi Gibson: 
Jody McCrea: Supporting Actor/Son Of Joel
Marshall Thompson: American TV Actor/"Daktari"
Shirley Patterson: American Actress
Kim Spalding: Actress/1950s-1960s
Ann Doran: American Actress
Dabbs Greer: Oscar winning actor, MARTY
Paul Langton: American Actor
Robert Bice: 
Richard Benedict: American Actor/Director
Richard Hervey: Actor
Thom Carney: Actor
Ray Corrigan: American Actor/Stunts

Arnold Laven: American Director/Producer
Edward L. Cahn: American Director/Producer