 Any champion who played five bonus rounds received a new car and retired undefeated.Succeeding Monty Hall's short-lived "It's Anybody's Guess", "Knockout" marked Ralph Edwards' third attempt at a daytime game on NBC in three years.After failing with two different short-lived versions of "Name That Tune," which had become a major hit off network, he banked on the appeal of former "Laugh-In" star Johnson who had, in the intervening years since that show's cancellation, become a regular panelist on games like "Hollywood Squares" and "Gong Show".