CBS would take over the exclusive broadcast rights to the NFL, including the Championship Game, in 1964. The following year, NBC obtained the broadcast rights to the upstart American Football League. In 1966, the two leagues agreed to merge. As part of the merger, the two leagues' champions would play a World Championship Game, eventually renamed the Super Bowl. Rather than award the broadcast rights of the game to either CBS or NBC, NFL commissioner Pete Rozelle decided to have both networks televise it. NBC commentators Curt Gowdy and Paul Christman called the game, while CBS produced the telecast that aired on both networks. In subsequent years, the Super Bowl would alternate between NBC and CBS (with each network airing the game exclusively to them). After the merger was completed in 1970, NBC would broadcast games from the American Football Conference, composed of the former AFL teams as well as three teams from the old NFL.