Bear Grylls and Jake Gyllenhaal Bear Grylls and Jake Gyllenhaal

Will he be forced to drink his own urine?

Jake Gyllenhaal will guest-star on the season premiere of Man vs. Wild (Monday, July 11, 9/8c on Discovery) as he joins Bear Grylls on a two-day trek among Iceland's mountains, glaciers, active volcanoes and unforgiving Mother Nature. Oh, and they'll be spelling something out too.

Check out photos from Man vs. Wild

Watch the preview: