Steve Allen and Ernie Kovacs departed [the] Tonight [show] in January 1957 after NBC ordered Allen to concentrate all his efforts on his Sunday night variety program, hoping to combat CBS's Ed Sullivan Show's dominance of the Sunday night ratings.
Tonight! America After Dark (1957)
Rather than continuing with the same format after Allen and Kovacs' departure from Tonight, NBC changed the show's format to a news and features show, similar to that of the network's popular morning program Today. The new show, renamed Tonight! America After Dark, was hosted first by Jack Lescoulie and then by Al "Jazzbo" Collins, with interviews conducted by Hy Gardner, and music provided by the Lou Stein Trio. This new version of the show was not popular, resulting in a significant number of NBC affiliates dropping the show.