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

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 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 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.

An unknown apex predator is preying on orcas and devouring whales off the frozen coast of Kodiak, Alaska, renewing fears of a prehistoric sea monster lurking in the icy depths of the northern Pacific Ocean. The team conducts an all-out hunt on land and sea using never-before-seen research from Sanderson's lost files -- can they identify the monster and uncover its lair before it strikes again?