Julia Roberts joins Bear on a special desert mission delivering life-saving vaccines to a remote village in Kenya. On their way there, they jump from a moving plane, navigate through dense underbrush and cross a river full of crocodiles and hippos.
Mel B joins Bear in Wales, where they navigate cliffs, cross challenging terrain and tackle a huge descent. Included: Mel administers unconventional first aid to Bear after he gets stung by a jellyfish.
Julianne Hough joins Bear on a trek in Africa, where they encounter a pack of elephants blocking their path. Other challenges include dealing with big cats and a snake; rappelling from a cliff; and navigating waterfalls.
In the third-season opener, Nick Jonas joins Bear for a snowy mountain adventure in the Sierra Nevada during blizzard conditions. The guys rappel down a sheer cliff, eat a frozen bird and swim across a freezing lake.