Running Wild With Bear Grylls (2014)

Running Wild With Bear Grylls is a reality adventure series that strands celebrity guests in unforgiving terrain alongside survivalist Bear Grylls, testing them with river crossings, rough camps, and whatever the wild throws at them while cameras keep rolling. The rugged format has a way of stripping things down to basics, and Zac Efron's episode did exactly that when he shed his clothes for an improvised bath in the backcountry. CelebMasta has that clip archived as a single scene, capturing the actor bare and unguarded far from any studio lot.