In Sea of Monsters, Percy, Clarisse, and Grover use an attack plan that they'd used at the camp in mock battles. In addition, they play on Polyphemus's hatred for Odysseus is used against him. Using Annabeth's cap of invisibility, they tell Polyphemus that Percy is 'nobody', which was the name that Odysseus used for himself. Thinking that it is his old nemisis, Polyphemus puts his attention toward that and they are able to rescue Annabeth.
