text: In the 1930s, Stone came to Los Angeles, California, to launch his own screen career. He was featured in the Tailspin Tommy adventure serial for Monogram Pictures. In 1939 he played Stephen Douglass in the movie Young Mr. Lincoln with Henry Fonda and Ward Bond. In 1939 he appeared in When Tomorrow Comes as head busboy (uncredited). In 1940, he appeared with Marjorie Reynolds, Tristram Coffin, and I. Stanford Jolley in the comedy espionage film Chasing Trouble. That same year, he co-starred with Roy Rogers in the film Colorado in the role of Rogers' brother-gone-wrong.
  Stone appeared uncredited in the 1939 film Blackwell's Island. Stone played Dr. Blake in the 1943 film Gung Ho! and a liberal-minded warden in Monogram Pictures' Prison Mutiny also in 1943. Signed by Universal Pictures in 1943, in the films Captive Wild Woman (1943), Jungle Woman (1943), Sherlock Holmes Faces Death [Captain Pat Vickery], (1944), he became a familiar face in its features and serials, starring as  hero Jim Hudson in The Great Alaskan Mystery (1944). In 1944, he portrayed a Ration Board representative in the Universal-produced public service film Prices Unlimited for the U.S. Office of Price Administration and the Office of War Information. One of his film roles was a radio columnist in the Gloria Jean-Kirby Grant musical I'll Remember April. He made such an impression in this film that Universal Studios gave him a starring role (and a similar characterization) in the 1945 serial The Master Key.  The same year, he was featured in the Inner Sanctum murder mystery The Frozen Ghost.  In 1953, Stone appeared as Charlton Heston's sidekick in Arrowhead, a Western also featuring Brian Keith and Katy Jurado.