It's been 15 years since the illustrious race between Walter the Tortoise and Murray the Hare but the passing of time hasn't tempered their bitter rivalry. When they hear about the upcoming Mt. Impossible Nature Adventure Race, they can't resist the opportunity to challenge each other to a rematch!
This time they enlist their children to be their teammates, but the kids don't share their parents' competitive nature. When Walter and Murray get separated from their kids, the two dads must team up to find them and learn there are far more important matters than winning a race!