Mack Sennett continued to use the Keystone Cops intermittently through the 1920s, but their popularity had waned by the time that sound films arrived. In 1935, director Ralph Staub staged a revival of the Sennett gang for his Warner Brothers short subject "Keystone Hotel", featuring a re-creation of the Kops clutching at their hats, leaping in the air in surprise, running energetically in any direction, and taking extreme pratfalls. The Staub version of the Keystone Cops became a template for later re-creations. 20th Century Fox's 1939 film "Hollywood Cavalcade" had Buster Keaton in a Keystone chase scene. "Abbott and Costello Meet the Keystone Kops" (1955) included a lengthy chase scene, showcasing a group of stuntmen dressed as Sennett's squad. (Two original Keystone Cops in this film were Heinie Conklin as an elderly studio guard and Hank Mann as a prop man. Sennett also starred in a cameo appearance as himself).