Dr. Heinz Doofenshmirtz is a fictional character and the main antagonist from the television show Phineas and Ferb. He was created by Dan Povenmire and Jeff "Swampy" Marsh, and is voiced by Povenmire. The character first appeared in the pilot episode of the series and appears in the majority of episodes. He is described as an incompetent and forgetful evil scientist intent on conquering the local "tri-state area" by creating obscure inventions. Dr. Doofenshmirtz speaks with a caricature of a German accent and comes from the fictional European country, Drusselstein. Doofenshmirtz appears in several merchandise pieces, including the book series and the video game.