A chimpanzee at an animal sanctuary escapes its enclosure and chases down a volunteer. Then, a surfer is ready to catch a wave when a great white shark knocks him off his board and attacks him.

Jim Lane is picking blueberries alone in the Blue Ridge Mountains when a timber rattlesnake strikes. Teacher Rachael Lilienthal is swimming in a Florida river when an alligator bites down on her arm, pulls her underwater and doesn't let go.

Taxidermist Wilf Lloyd is elk hunting with his son-in-law in the Canadian Rocky Mountains when a grizzly bear charges. Spearfisher Anthony Segrich is miles from shore, diving 180 feet below the surface when a bull shark races at him, jaws wide open.

Erin Greene is walking home from a Halloween party in a small arctic town when a polar bear chases her down. Triathlete Chuck Anderson is swimming in the Gulf of Mexico when a bull shark attacks, biting his arm and pulling him to the ocean floor.

Diver Tim Saxon is filming underwater at the Great Barrier Reef when an Irukandji jellyfish, one of the most world's most venomous animals, stings him. Forester George Knoll is working in the remote Great Bear Rainforest when a grizzly bear attacks.

Joe Azzouggagh and his German Shepherd, Ace, are deep in the Ontario wilderness when a black bear charges them. Single father Andrew Dickehage is forced to walk 6 miles along a rural road at night, where he's attacked by unseen predators.