Part 1: Miranda Hart
Bear Grylls takes comedy writer and actress Miranda Hart on a once-in-a-lifetime expedition to the spectacular Swiss Alps. Bear challenges novice Miranda to go far beyond her comfort zone with a series of exhilarating adventures during an intense two-day expedition. Miranda traverses a glacier, crosses crevasses roped to Bear, tackles deep snow in snow shoes and completes a huge boulder scramble. She also faces her greatest fears when she flies in a helicopter and abseils down a waterfall.

Part 2: Jonathan Ross
Bear Grylls helps Jonathan Ross to discover his inner Tarzan on a once-in-a-lifetime expedition to the magnificent rainforests on the volcanic island of La Palma, one of the least-known of the Canaries. Bear challenges novice Jonathan with a series of exhilarating adventures during an intense two-day trip, including trekking through dense jungle with machetes, SAS-style fast-roping from a helicopter, a walk down an active volcano and sleeping in a cave in a steep cliff face. Bear and Jonathan have to fend for themselves, including preparing wild animals for food.