As if right out of a science fiction movie, Bear Grylls swoops in on a jetpack to pick up funnyman Keegan-Michael Key, kicking off their adrenaline-pumping adventure in the lava fields of Iceland. The "Key & Peele" star must put all jokes aside to face some of his greatest fears and conquer the lunar landscape. From a perilous rappel off a sheer 200-foot cliff to an endurance-testing jumar climb, Keegan-Michael is pushed beyond mental and physical limits in a truly life-changing experience.

Bear Grylls invites MMA fighter turned actress, Gina Carano, on a journey across the Dolomite mountains of Italy. Gina is tested from the outset as the two are lowered onto a mountain peak to begin their epic journey. Intensity grows as they navigate the jagged peaks and are forced onto a ledge to retrieve a barrel 200 feet in the air. But when they face the biggest rappel in show history, Carano walks to the edge of completely shutting down.