Josh Gates investigates several mysterious tragedies and downfalls. An expedition crew goes insane, turning cannibalistic; an explorer searches for a lost city in the Brazilian rainforest; an aspiring young actress falls victim to a deranged killer.

New evidence suggests the infamous outlaw Billy the Kid may have lived to old age under an alias. Modern scholars explore the true identity of the Man in the Iron Mask. After their UFO encounter, Betty and Barney Hill were forever changed.