He was the master of ceremonies for the first Your Hit Parade radio program and also worked as an announcer for The Beatrice Lillie Show.

In 1935 Hull was signed to a contract by Warner Bros., and spent the next few years playing leading men both in dramas and musicals.

He teamed with Patricia Ellis, one of his leading ladies at Warners, for the Republic Pictures musical Rhythm in the Clouds (1937).

Two of Hull's better-known appearances of this period were opposite Boris Karloff, in The Walking Dead (1936) and Night Key (1937).

Warren Hull was signed for Columbia's second (and perhaps best) serial production, The Spider's Web (1938), based on a popular magazine character.

Hull played three parts: criminologist Richard Wentworth, his masked-and-caped alter ego The Spider, and, in a second masquerade, lowlife mobster Blinky McQuade.

Hull kept audiences following the Spider's thrilling exploits, making The Spider's Web the most popular and profitable serial of the year, outstripping such worthy cliffhangers as Buck Rogers and Dick Tracy Returns by a wide margin, according to a tally published in the Motion Picture Herald and The Film Daily.

In the mid-1940s, Hull returned to radio announcing, appearing with frequency on such programs as Your Hit Parade and Vox Pop.

During World War II, Hull traveled about the country and in Canada, putting on Vox Pop before servicemen at camps and bases.

[9] For his contributions to the radio and television industry, Warren Hull has two stars on the Hollywood Walk of Fame.