The Range Busters were a film series of 24 Westerns of the adventures of a trio of cowboys, many filmed at the Corriganville Movie Ranch, produced by George W. Weeks and distributed by Monogram Pictures.
Ray "Crash" Corrigan had previously made 24 films in Republic Pictures The Three Mesquiteers series. When he and ventriloquist Max Terhune who had made 21 films in the series both had disputes over money with Republic, Corrigan went to producer George W. Weeks with the idea of a similar series that would be distributed by Monogram Pictures and filmed at the Movie ranch with Western sets owned by Corrigan, the Corriganville Movie Ranch in the Simi Hills of the Simi Valley. Corrigan said in an interview that he received 50% of the profits of the series.
The first film in the series in 1940 was appropriately titled The Range Busters. Monogram also had another "Trigger Trio" series of "the Rough Riders" which ended in 1942 after Buck Jones's death and Colonel Tim McCoy returning to active service.
Though the characters were the same, the series inexplicably changed time periods, going to contemporary times for 1942's Texas to Bataan, Cowboy Commandos and Black Market Rustlers (both 1943) then reverting to the Wild West days for the others in the series.
Corrigan left the series temporarily over money disputes and was replaced by ace stuntman David Sharpe beginning with Texas to Bataan. In Haunted Ranch (1943) Sharpe enlists in the US Army to fight in the Spanish American War. In real life both Sharpe and King joined the US Army Air Forces. Corrigan returned to replace Sharpe with Deputy Rex Lease taking Sharpe's place half way though the film. Dennis 'Denny' Moore replaced Lease in the last four films of the series that ended in 1943's Bullets and Saddles. An experienced Western star, Moore was unfit for military service due to the injuries he received in an airplane crash.
After the last Range Buster film, 1943's Bullets and Saddles, Corrigan mostly played in films wearing his gorilla suit in such films as Nabonga and gave his full attention to Corriganville. When Corrigan opened Corriganville for the general public, he hired Terhune to entertain.