In the 1940s, Sten appeared in several films, including "The Man I Married" (1940), "So Ends Our Night" (1941), "Chetniks! The Fighting Guerrillas" (1943), "They Came to Blow Up America" (1943), "Three Russian Girls" (1943), and "Let's Live a Little" (1948). Sten continued making films in the United States and England, but none of them were successful. Attempting to rectify this situation by studying at The Actors Studio, Sten appeared in several television series during the 1950s, including "The Red Skelton Show" (1956), "The Walter Winchell File" (1957), and "Adventures in Paradise" (1959).