Perry the Platypus, also known as Agent P or simply Perry, is an anthropomorphic platypus from the animated series Phineas and Ferb. Perry was created by the series' co-founders, Dan Povenmire and Jeff "Swampy" Marsh. He first appeared along with the majority of the main cast in the pilot episode "Rollercoaster." Perry is featured as the star of the B-plot for every episode of the series, alongside his nemesis Dr. Heinz Doofenshmirtz. A mostly silent character, his lone vocal characteristic (a rattling of Perry's beak) was provided by Dee Bradley Baker.