As Marshall, Gilbert and Amy are preparing for her father’s Spooktacular Halloween-themed wedding to his fiancé Carl, plans go awry when they discover that their mummy friend Harold and his beloved Rose may be in danger.

Survivalist Bear Grylls turns the tables to America's armchair adventurers by creating wilderness simulated challenges that will test the contestants' smarts, physicality and their ability to adapt and do whatever it takes to survive.