After serving in World War I, Roy Barcroft spent most of the 1920s and early 1930s moving from job to job. It was in the 1930s, after he moved to California with his wife, that he found his calling while acting in amateur theatrical productions. In 1937 he was appearing in bit parts in various genres, but by 1938 he was in westerns, where he became a well-known (and memorable) "heavy". Roy would alternate among Monogram, Universal, Columbia and other studios. In 1943, however, he signed an exclusive ten-year contract with Republic Pictures and became the convincing, and tireless, menace to all the good people in the West. He also did more than sneer at the likes of Don 'Red' Barry, Bill Elliot, Sunset Carson and Allan Lane. Roy acted in The Fighting Seabees (1944), which starred John Wayne