One of the many notorious 70's "unknown" documentaries, The Mysterious Monsters covers topics such as Bigfoot and the Loch Ness Monster. Pictures, sounds, and videos of these two monsters are examined by Peter Graves, the host. Psychics, hypnotism, and the history of Bigfoot in many ancient cultures is also scrutinized.

People go and search for the legendary Bigfoot creature.

The four grand old men of “Bigfoot Hunting” and their often humorous yet determined forty-year quest to find the Big Hairy legend of North America.