The team investigates a stranger-than-fiction murder mystery involving the Wildman of Minnesota; known as the Ice Man, its body became a sideshow attraction that Sanderson examined himself before it mysteriously disappeared.

The team makes a discovery while investigating sightings of a large bird of prey terrorizing Chestnut Ridge, Pennsylvania; Sanderson believes it to be the mysterious thunderbird, a razor-clawed predator documented in Native folklore.

The team investigates recent encounters with a monstrous apex predator in the wilderness of British Columbia; using never-before-seen clues from Ivan Sanderson's lost archive, they uncover new evidence that may finally distinguish fact from fiction.

The team hunts a dog-like creature in the mountains of the Carolinas.