Professor Von Doofenshmirtz is the main antagonist in the Phineas & Ferb Episode; Steampunx. He's the 1903 equivalent (and possible ancestor) of Heinz Doofenshmirtz. He was an evil inventor who seeked to destroy the Danville World Fair for unknown reasons. He's rivals with Swerry the Swan, who is the 1903 equivalent of Perry the Platypus.
Professor Von Doofenshmirtz created a giant robotic swan to destroy the Danville World Fair, for some reason. However, he ended getting thwarted by Swerry , who then destroy the giant swan, sending von Doofenshmirtz soaring into the sky. In the end of the episode, Von Doofenshmirtz wasn't seen ever since until over 100 years later, he fell from the sky into the Flynn-Fletchers's backyard at the present timeline, alive but extremely old. Von Doofenshmirtz then wonders how long was he up there. It is unknown what happened to him afterwards.
- Unlike most ancestors of Doofenshmirtz who are most likely to be deceased, Professor Von Doofenshmirtz is still alive.
- The way how Professor Von Doofenshmirtz returned from falling the sky as an old man, hundred of years old, is similar to how Alden Bitteroot returned as an old man, hundred of years later, after coming out of a well he was trapped in. However, unlike Professor Von Doofenshmirtz, Alden Bitteroot fell back into the well again.