Perry the Platypus, codenamed Agent P, is one of the main characters from the Disney Channel animated series Phineas and Ferb. He is the pet platypus of Phineas Flynn and Ferb Fletcher. Unbeknownst to his owners, he lives a double life as a secret agent for The O.W.C.A. (The Organization Without a Cool Acronym, a.k.a. "The Agency"), a government organization of animal spies. In the Agency, his immediate superior is Major Monogram. Perry has a lair under the Flynn-Fletcher's house that can be entered through various passages. One example is the Chimney Vator, in which he once encounters Santa Claus.
His nemesis is Dr. Heinz Doofenshmirtz. Perry's mission is almost always foiling the doctor's plans, which he successfully accomplishes almost every time even with minimal details about the plans. During these missions, his battle with Dr. Doofenshmirtz usually ends up cleaning up what Phineas and Ferb have been working on that day.
Appearances in Christmas specials
In the second Phineas and Ferb Christmas episode, "A Phineas and Ferb Family Christmas", which actually takes place first chronologically, Perry heads to Doofenshmirtz's headquarters and finds his nemesis in the middle of decorating his headquarters for Christmas (because he thinks it is already December as a result of seeing The 12th Annual Phineas and Ferb Christmas Special being broadcast on TV). Doofenshmirtz traps him in Christmas wrapping paper and explains his plans to use his Transportinator to transport himself into the department stores so he can do his Christmas shopping. Perry escapes and, after a brief battle with the doctor, uses the Transportinator to beam himself back to his home. Perry is later shown decorating his lair while the other characters sing "We Wish You a Merry Christmas".
Later in chronological order, in Phineas and Ferb Christmas Vacation!, Perry shows up at the O.W.C.A.'s Christmas party, where he receives A Sal Tuscany Christmas CD from his Secret Santa. He does not get to enjoy the festivities for long, though, as he is soon briefed on a mission to go stop Dr. Doofenshmirtz, who has built a Naughtyinator with which to ruin Christmas. When he arrives of Doofenshmirtz's building, he gets trapped in a Christmas tree stand and tied with Christmas lights (and has a partridge placed on his bill). In his attempts to escape, he ends up shaking loose his Sal Tuscany CD, which Doofenshmirtz then plays on his stereo, eventually playing it loud enough to destroy the Naughtyinator. Perry manages to escape the trap and then sticks Doofenshmirtz in it. Later, during the end credits, Perry pays Doofenshmirtz a visit to exchange gifts. He gives Doofenshmirtz some almond brittle, and the doctor gives him a vase.