Bear Grylls takes actor Zac Efron on an adventure-filled trip into the wilds of the Catskill Mountains.

Bear Grylls takes Ben Stiller on an epic adventure of survival through the mountains of Scotland's Isle of Skye.

Hollywood superstar Channing Tatum and Bear Grylls chopper into the wilds of the Sierra Nevada for a high altitude, high stakes adventure.

Comic and actor Tom Arnold heads into the wilds of coastal Oregon with Bear Grylls for an ultimate lesson in survival.

MSNBC anchor and reporter Tamron Hall steps outside her comfort zone to explore the beautiful but brutal desert of southern Utah with the legendary Bear Grylls.

Bear Grylls takes NFL Hall of Famer Deion Sanders into the wild to face his toughest opponent yet: the hills of the desert southwest.

Actress Brie Larson accompanies Bear Grylls on a jungle adventure across a remote island in the Gulf of Panama. They begin their journey by jumping out of a helicopter into the ocean. From there, they make a perilous trek through a crocodile-filled mangrove swamp that turns into a dangerous maze as the tide rises.

The often clever, always snarky actor and comedian Joel McHale joins Bear Grylls in the Arizona desert for an adventure unlike any other. They set out to traverse a massive slot canyon in hopes of surviving the wild, but first they have to survive one another! Huge cliffs, nasty food and unorthodox survival strategies abound in this hilarious misadventure

Actress, supermodel and social-media influencer Cara Delevingne realizes a long-held dream of accompanying Bear Grylls on an adventure. Sweeping Cara off her scooter and onto a helicopter, Bear leads Cara up the mountains of Sardinia. At nearly a mile high in elevation, Bear shows Cara how to brave several heart-stopping obstacles including pulling herself across a horizontal line suspended 200 feet in the air and rappelling down a dangerous waterfall.

Comedic actor Rob Riggle joins Bear Grylls on an adventure on Iceland’s Vatnajokull Glacier. Their journey begins with a helicopter ride over “the land of fire and ice,” aptly named for constant volcanic activity beneath the surface. Once dropped off, Bear and Rob must navigate a stretch of jagged ice fields, deep moulins and deep crevasses. Without food or supplies to make shelter, their mission is to find an airdropped emergency cache.

Golden Globe-nominated actor Armie Hammer pairs with Bear Grylls to scuba dive in search of an underwater sea cave reportedly used by smugglers somewhere off the coast of Sardinia. Along the way, Armie battles his paralyzing fear of heights and samples some local delicacies — and things take an unexpected turn when he gets hijacked in the middle of the expedition.

Bear Grylls takes former WWE world champion and action star Dave Bautista on a super-sized adventure in the Arizona desert. Navigating through perilous canyon descents, brutal falls and the raging Colorado River is no easy task. With Bear as his tag-team partner, Dave is up for the challenge to see if he still has that fight inside, but Mother Nature could prove to be his toughest opponent yet in this match of a lifetime.

It’s been five years since Channing Tatum first appeared on Running Wild with Bear Grylls, and he’s back for more – this time in the wilds of Norway! Their journey kicks off by skydiving into brutal terrain where giant boulder fields and towering cliffs stand in the way of extraction. During their seven-mile trek, Bear tests Channing to see how far he’s come as a survivor – from foraging for food to Navy SEAL-style cold-water immersion training. Channing even learns the ancient art of trout tickling.

Free Solo rock-climber Alex Honnold joins Bear Grylls for a breathtaking adventure through the Swiss Alps! Alex is no stranger to dizzying heights, but he’s not used to falling from them, so Bear kicks off the journey with a skydive into the jagged mountains. From there, it’s a six-mile trek through craggy valleys and sheer cliffs where Bear teaches Alex how to survive in the wild, but the tables turn when Alex takes Bear on a hair-raising climb.

On-air radio personality Bobby Bones joins Bear Grylls for the adventure of a lifetime in a massive Norwegian Fjord! A helicopter ride into the mountains is where their journey begins, but from there, danger lurks at every turn – from giant rock domes and deadly bogs to raging rivers with currents strong enough to move cars. On top of that, the only way to reach their extraction is to rappel down a 300-foot waterfall.

Bear Grylls and actor Zachary Quinto race the clock to traverse a dense Panamanian jungle before an impending storm makes landfall. Their adventure begins with a helicopter ride, but once dropped off deep in the brush, they must rely on a primitive navigation technique to help them reach their extraction point, and it won’t be easy! From massive cliffs and steep ravines to an underground river cave and an old crashed plane, there are obstacles at every turn.

Actor Anthony Mackie joins Bear Grylls for a journey in the Italian Dolomites mountain range.

Bear takes Bobby Bones back into the wild with his new fiancee, Caitlin Parker.

Bear takes actress Courteney Cox on a harrowing and emotional trek through the Irish Highlands.

Olympic gold medalist Lindsey Vonn joins Bear on a harrowing journey along the Corsican coastline.

Bear and President Obama venture into the wilds of Alaska, sharing stories and conversing on everything from fatherhood to climate change.

Orange Is the New Black actress Uzo Aduba joins Bear for a heart-stopping adventure in Spain's remote Pyrenees mountains, where steep cliffs, deadly predators and punishing weather test Uzo's mental and physical resolve on a truly wild adventure.

Bear Grylls takes champion racer Danica Patrick out into the Moab desert for some high-octane, pulse-pounding action in the wild. Together they face off against venomous creatures, sheer cliffs and scorching heat as they make their way across some of the harshest terrain around. Still, nothing is more intimidating than the final challenge that leaves even Danica Patrick unnerved.

Bear Grylls inspires Rainn Wilson to work for it by having him search for hidden caches in the aspen forest and alpine terrain of the La Sal mountains in a time-tested method of mountaineering training. Bear pushes Rainn to the limits of his endurance with dangerous rappels and dizzying climbs, but it's not until they fish for food that things take a revealing turn in what is definitely the most naked RUNNING WILD in the history of the show!

As if right out of a science fiction movie, Bear Grylls swoops in on a jetpack to pick up funnyman Keegan-Michael Key, kicking off their adrenaline-pumping adventure in the lava fields of Iceland. The "Key & Peele" star must put all jokes aside to face some of his greatest fears and conquer the lunar landscape. From a perilous rappel off a sheer 200-foot cliff to an endurance-testing jumar climb, Keegan-Michael is pushed beyond mental and physical limits in a truly life-changing experience.