The original Rin Tin Tin's first starring role was in Where the North Begins (1923), playing alongside silent screen actress Claire Adams. This film was a huge success and has often been credited with saving Warner Bros. from bankruptcy. It was followed by 24 more screen appearances. Each of these films was very popular, making such a profit for Warner Bros. that Rin Tin Tin was called "the mortgage lifter" by studio insiders. Rin Tin Tin, Jr., appeared in several short films in the 1930s. Rin Tin Tin III starred alongside a young Robert Blake in 1947's The Return of Rin Tin Tin but is primarily credited with assisting Duncan in the training of more than 5,000 dogs for the World War II war effort at Camp Hahn, California.