Carson first asks Muhammad Ali about his heavyweight title defense four days earlier against Alfredo Evangelista, where he did not do as well as expected. Ali first jokes about Johnny getting old, and then points out that he did win regardless of how; Evangelista was 13 years younger, so his strategy was to let him expend his energy, and take control in the final rounds. They then discuss his film "The Greatest". Ali says that since he was playing himself, he didn't see the script until the day of shooting. He isn't sure if he would like to do additional acting. A clip is shown, and Ali explains that the incidents in the clip (involving Sonny Liston) really did happen. Peter Falk talks about his upcoming "Columbo" show in which a Mensa-type society plays a role. Johnny then has the trial quiz from Mensa, which they try. Johnny gets 3/5 correct. Falk then presents a puzzle from the episode, and a short clip is shown. Johnny claims to know the answer (after Ed makes the first attempt) but does not reveal it on the air after Falk asks him not to. Steve Landesberg does a stand-up comedy routine; during his interview he jokes about boxing. Carl Sagan talks about intelligence in humans and other animals, the topic of his book "The Dragons of Eden".
—lenab9011