Actor Joseph Gordon-Levitt tackles Kenya's unyielding terrain with Bear Grylls. Dropped into the elements from a helicopter, Joseph and Bear navigate a perilous rappel, milk a camel for needed hydration, and ascend a massive rock dome that tests Joseph's fear of heights like nothing before. As the duo battles a crocodile for the remains of a water buffalo that is their only hope for dinner, Joseph details his rise to fame and his efforts to honor the memory of his beloved brother.

Actress Keri Russell joins Bear on an epic journey to the Canary Islands off the coast of Africa. After battling the dangerous, rolling rocks of a massive volcano, the duo descend into a mysterious canyon where they source a meager dinner of undigested seeds from a pigeon carcass, and test their luck with a grappling hook to escape the towering canyon walls. Later, after a cringe-worthy breakfast of crickets, Keri and Bear make a daring escape from a mountain peak using a paraglider. Along the way, Keri reveals her path to fame, her love of family, and the playful struggles of ...

Actress Lena Headey joins Bear on a 48-hour expedition through the steep cliffs and icy waters of Spain's Iberian Peninsula. Can she handle the punishing conditions?

Movie star Don Cheadle joins Bear on a 48-hour trek through the unrelenting White Mountains of New England. It's rugged, remote and full of dangerous rivers.

Dancer and choreographer Derek Hough joins Bear on a whirlwind adventure across the mountains of Bulgaria.

Bear takes Scott Eastwood climbing treacherous mountains in the Balkans.

Bear and tennis champion Roger Federer hit the slopes the hard way.

Dropped amidst snow capped mountains, Uzo and Bear move quickly as a storm sets in, sending hail, lightning and flash floods their way. Along the way they come face to face with a poisonous viper, get creative to secure a dinner of field mice, and use a crossbow to zip line across a 250 ft. drop. Despite the elements, Uzo shines as she recounts her long road to fame, her family's emigration from Nigeria, and her pride in representing the American dream.