A U.S. Army veteran, an ultra-marathoner and a world-record weightlifter face the biggest battles of their lives as they take on Bart, Honey Bump and Tank in challenges of strength, speed and strategy, but it's the underdog who shocks Bear Mountain.

With odds stacked against them, a bodyguard, a firefighter and an ultra-fit football coach take on three massive grizzlies in a gauntlet of challenges; as they fight for a place in the finale, each discovers just how badly bears don't like to lose.

The grizzly bears take on a bodyguard, a firefighter, an ultra-marathoner, and a world-record weightlifter.

The grizzlies welcome a Highland games strongman, an Alaska state trooper and a Southwest aircraft handler to Bear Mountain; Bart makes sure the humans aren't the only mammals who end up in the water.

Bart the bear faces the mightiest human yet in national arm-wrestling champion Bruce; Honey Bump schools New Jersey native Christina; MMA fighter Jesse fights for a chance at a cage match with a grizzly.

A fire captain who witnessed his best friend attacked by a grizzly returns to face his greatest fear; a champion bull rider discovers his threshold for pain against an apex predator; a Polynesian fire dancer stuns Bart with his first ever defeat.