Invasion, U.S.A. is a 1952 American drama film based on a story by Robert Smith and Franz Spencer and directed by Alfred E. Green. The film stars Gerald Mohr, Peggie Castle and Dan O'Herlihy. Invasion, U.S.A. is set in the Cold War and portrays the invasion of the United States by an unnamed communist enemy which likely refers to the Soviet Union. It is typical of the Red Scare film genre, common throughout the 1950s.