Colin O'Brady challenges the Millers and Thompsons to a three-day race along lava rock, across the desert in all-terrain vehicles, and up a treacherous climb to a 7000-foot peak. It's a race where every step counts. Who will be the first to stumble?

Colin O'Brady challenges the Dixons and Purefoys to survive three wild days as they scramble over treacherous lava, through a windswept desert, and up a 7,000-foot rocky peak. Which family will take home $10,000?