The twins Robin and Rachel reluctantly accompany their family on a vacation to Three Lakes. While their parents are distracted, the twins try to have fun but lose track of their younger siblings Rhea, Juno and Jenny. The younger siblings get lost in the woods but find shelter in a cabin belonging to "Alon Bigfoot". Robin and Rachel find the lost siblings at the cabin and convince them to return home, though Rhea wants to stay to visit Bigfoot again. Rachel claims to have seen Bigfoot herself at the cabin before they left.