06/29/2011 12:09 pm ET | Updated Aug 29, 2011

Jake Gyllenhaal In 'Man Vs. Wild' Trailer: Joins Bear Grylls In Iceland

Jake Gyllenhaal has a fear of heights.

So perhaps climbing an icy mountain in Iceland wasn't the best idea. Climbing an icy mountain in front of a camera? Definitely not the best idea.

Gyllenhaal guests in the season premiere of "Man vs. Wild," taking to the harsh, rocky outskirts of Iceland alongside insane adventurer host, Bear Grylls. In this first clip, the "Source Code" star reveals his fear of heights -- and the unfortunate, nerve-induced positioning of his manhood.

The episode premieres on July 11th on 9/8c on Discovery.