Bear Grylls

play1:31
'Hostile Planet' Sneak Peek: Bear Grylls Traverses the Ever-Changing Extreme Polar Region (Exclusive)

'Hostile Planet' Sneak Peek: Bear Grylls Traverses the Ever-Changing Extreme Polar Region (Exclusive)

The 'Hostile Planet' series finale airs Monday, May 6 at 9 p.m. ET/PT on National Geographic.

Don Cheadle Faces His Fear of Heights With Bear Grylls -- See the Stunning Pics! (Exclusive)

First Look: Don Cheadle Faces His Fear of Heights With Bear Grylls (Exclusive)

ET exclusively debuts the first photos from the 'Avengers: Infinity War' star's journey on 'Running Wild With Bear Grylls.'

12