It's fish-out-of-water time as the ladies travel to the rainforest of Costa Rica. Zip lining through the jungle canopy has the O.C. ladies screaming with excitement, while their shifting friendships have them screaming at each other. Vicki's erratic behavior has the others worried that she's having a mental breakdown, while the collective whip comes down hard on Alexis as the group conducts a "makeshift intervention" to confront her on her phony lifestyle.