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.