No, this isn’t an episode of “Naked and Afraid,” though you can’t be blamed for thinking that.

Zac Efron joined Bear Grylls for his latest nature adventure series, “Running Wild with Bear Grylls,” and things got extremely… shirtless.

In a new clip for the NBC show’s first episode (via “TV Guide”), the two prepare to rappel down a cliff in the Catskills Mountains and, at Grylls’ suggestion, take off their t-shirts for the climb down.

As a way to make sure they’re “committed” to getting down, he then throws their packs off the cliff and into the water.

At one point, Efron makes an anxious sigh to the camera, before gamely saying, “I’m as ready as I’m gonna be, man... Let’s do it, brother.” Then, tied together, they make their journey down the cliff.

Other upcoming celebrity guests include Channing Tatum, Ben Stiller and NFL alum Deion Sanders.

NBC’s “Running Wild with Bear Grylls” will bow on Monday, July 28 at 8pm. Will you be tuning in? Check out the clip and let us know!

Photo by: BGV - Delbert Shoopman/NBCWESTWOOD, CA - APRIL 28: Actor Zac Efron attends Universal Pictures' 'Neighbors' premiere at Regency Village Theatre on April 28, 2014 in Westwood, California. (Photo by Jason Merritt/Getty Images)

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