On the topic of History's Most Plausible Conspiracy Theory, the six up for consideration between Craig and the panelists - astronaut Michael J. Massimino, comedian Kurt Braunohler and writer/director Judd Apatow - are: the Illuminati; Hollow Earth; Fake Moon Landing; Area 51; is there really gold in Fort Knox; and who killed John F. Kennedy. Beyond the merits of each of the six, the panelists talk about why the public has a fascination with conspiracy theories despite their connotation to mental instability. Massimino talks about his unique perspective to the moon landing, and to Area 51. They also talk about conspiracies that could be related to their own professional lives. They conclude by talking about conspiracies that did not make the list but perhaps should have.