Dave presents the (fake) opening credits of the second presidential debate, which closely resemble Magnum P.I.; Debra Messing plugs "The Starter Wife" and takes a jab at Sarah Palin; Alan's tour of the Late Show control room is sabotaged; Alianca da Terra founder John Carter discusses the plight of the Amazon rainforest; Tegan and Sara performed "Call It Off."
While one team's members go home to their loved ones, another team spends 24 hours with a trainer; contestants face a competition that tests their endurance as never before; a group of contestants faces the wrath of the trainer.