Perry the Platypus, codenamed Agent P, is Phineas and Ferb's pet platypus, who, unknown to his owners, lives a double life as a secret agent for a government organization of animal spies. While he was spending the time of his life at Phineas and Ferb's backyard beach party, Perry received a very important call from his superior, Mr Major Monogram. It seems something bad is happening in town and only Agent P can successfully solve the mystery. Well, boys and girls, it's time for Perry the Platypus to leave the party and prepare for his new mission and for that the skillful Agent P needs a bit of your help. Show off your fashion skills while playing the "Agent P" dress up game and help him disguise for his important undercover mission choosing from his secret wardrobe the best outfit and accessories to put together the perfect outfit for a secret agent!