A black bear charges Joe Azzouggagh and his German shepherd, Ace, deep in the Ontario wilderness. Single father Andrew Dickehage, forced to walk six miles along a rural road at night, comes under attack from unseen predators.

Diver Tim Saxon films underwater at the Great Barrier Reef and gets stung by an Irukandji jellyfish, one of the world's most venomous animals. A grizzly bear attacks forester George Knoll in the remote Great Bear Rainforest.

A polar bear chases down Erin Greene as she walks home from a Halloween party in a small arctic town. A bull shark attacks triathlete Chuck Anderson in the Gulf of Mexico, biting his arm and pulling him to the ocean floor.

A grizzly bear charges taxidermist Wilf Lloyd while he hunts elk with his son-in-law in the Canadian Rocky Mountains. Miles from shore, diving 180 feet below the surface, spearfisher Anthony Segrich finds a bull shark charging toward him.

Jim Lane is picking blueberries alone in the Blue Ridge Mountains when a 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.

Andrea Schlake is volunteering at an animal sanctuary when a chimpanzee escapes its enclosure and chases her down. Surfer Todd Endris is ready to catch a wave when a great white shark knocks him off his board and attacks him.