S1, E4: World-renowned survivalist Bear Grylls (“Get Out Alive with Bear Grylls,” “Man vs. Wild”) takes Tom Arnold (“Sons of Anarchy”) through the unpredictable coastal mountains of Oregon, taking on steep terrain, river crossings and oceanside cliffs. Arnold attempts to channel the courage and determination from his weight-loss struggle in order to tackle a journey that takes him to the brink of mental and physical exhaustion.