Dr. Heinz Doofenshmirtz

Dr. Heinz Doofenshmirtz, often called "Doof" or "Dr. D" for short, is a fictional character from the American animated television series Phineas and Ferb and Milo Murphy's Law. He was created by Dan Povenmire and Jeff "Swampy" Marsh, and is voiced by Povenmire. Doofenshmirtz is a cartoonishly evil scientist intent on conquering the Tri-State Area using his inventions. Much of the humor associated with Doofenshmirtz comes from the combination of his archetypical megalomania juxtaposed with his affable personality. Doofenshmirtz speaks with a caricature of a German accent and is from the fictional European country Drusselstein.

Doofenshmirtz appears in several merchandise pieces, including a book series and a video game. After first appearing in Milo Murphy's Law in a guest role in the first-season finale, subsequently he becomes in a major supporting character throughout the rest of the series, moving into the Murphy's house after his building is destroyed.