Josh Gates dives into all things unknown from the Bermuda Triangle to UFO sightings. Joining the search are Evil Dead's Bruce Campbell, Lost's Michael Emerson, former CIA agent Mike Baker, comedian Mo Mandel and Naked and Afraid's Gwen Grimes.

In honor of D-Day, Josh interviews actor Dennis Quaid and Seal Team 6's Will Chesney who was part of the raid that took out Osama Bin Laden. Josh also learns the hard way that our military's canine unit is more effective than ever.