Bear runs wild with Hollywood stars
Zac Efron, Ben Stiller and Channing Tatum are among the Hollywood stars taking part in Bear Grylls' new reality show.
Running Wild With Bear Grylls sees a different celebrity embark on an expedition into the wilderness with the British adventurer in each episode of the NBC show.
The trailer shows the A-list actors rock climbing, abseiling and trekking with Bear, as well as opening up to him about their private lives as they each take on challenges and embark on a journey of self discovery.
Tropic Thunder star Ben - who is seen jumping off a cliff into the sea - shouts: "This is insane!" as he abseils down a rock face.
Actor and comedian Tom Arnold confesses: "This is way harder than any movie."
Heartthrob Zac is seen high-fiveing Bear as they climb into a cave in the trailer, while action star Channing has posted a picture of himself and Bear in a helicopter on his Instagram page.
As well as taking on physical challenges, the stars will also be forced to eat bugs as Bear shows them how to survive in the wilderness.
NBC news anchor Tamron Hall, 43, is the only woman to take on the challenge, and sportsman Deion Sanders is seen confessing to Bear how he had suicidal thoughts when he lost custody of his kids, as they have a heart-to-heart in the outback.
The show begins on US TV later this month.