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 & doesn't let go.

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 & pulling him down.