In the season premiere of "Running Wild with Bear Grylls," music sensation Nick Jonas joins Bear for an icy journey across the Sierra Nevada Mountains. With a blizzard bearing down, Nick and Bear must rappel down a sheer cliff before navigating an avalanche-prone mountain face. Building camp under harsh conditions, the two feast on a frozen bird, and eventually make a heart-stopping swim across a freezing lake. Along the way, Nick discusses his career, his family, and reveals how his struggle with diabetes gave him the drive to reach the pinnacle of the music world.

Julianne Hough and Bear initially navigate the unforgiving African terrain on ATV and must elude a pack of elephants that block their path. Rappelling from a sheer cliff, they enter a remote canyon where they evade big cats, come face-to-face with a massive snake, and navigate treacherous waterfalls before reaching their extraction point. As they make their way through the dangerous and unpredictable landscape, Julianne shares her personal story of adolescence, and the positivity and unwavering determination that got her to the top.

Dropped along the wind swept coastline of Ireland, television icon Courteney Cox and Bear must navigate jagged peaks and descend sheer cliffs, only to be battered by ocean swells. As they contend with the elements, the two struggle to stay warm and must subsist on a meager diet of maggots sourced from a rotting sheep. Courteney's limits will be tested, but her spirit shines while sharing insights on life, loss and the joy of motherhood.