Rocketship X-M (a.k.a. Expedition Moon and originally Rocketship Expedition Moon) is a 1950 American black-and-white science fiction film from Lippert Pictures, the first outer space adventure of the post-World War II era. The film was produced and directed by Kurt Neumann and stars Lloyd Bridges, Osa Massen, John Emery, Noah Beery, Jr., Hugh O'Brian, and Morris Ankrum.
Rocketship X-M tells the story of a Moon expedition that, through a series of unforeseen events, winds up traveling instead to distant Mars. Once on the Red Planet, its crew discovers the remnants of a Martian civilization destroyed long ago by atomic war and now reverted to barbarism.