The Regurgitator is a villain from the TV series Phineas And Ferb and is described as "The World's Most Evil Villain" - he is rumored to be even more villainious than Dr. Doofenshmirtz (the show's most recurring villain). He first appeared in the episode Oh, There You Are Perry as the main antagonist and later makes a cameo appearance in the episode Rollercoaster: The Musical!.
According to O.W.C.A., the Regurgitator is known to having evading authorities for his past villainy, and has been taking refuge in the Quad-State Area. O.W.C.A. Agent Perry the Platypus is assigned to deal with him, but he is distraught to find out that he would to be relocated from Danville, meaning that he can never see the Flynn-Fletchers again. As such, Perry feels sad about this before flying away from the Flynn-Fletcher house. Even Doofenshmirtz is very upset about Perry's relocation after hearing of it, and decides to best out on the Regurgitator so that he can go back being Perry's nemesis again.
After driving to the Quad-State Area, Doofenshmirtz manages to locate the Regurgitator's lair, only to find that the Regurgitator has already captured Perry. Recoginizing Doofenshmirtz as the 'lunatic' from Danville, the Regurgitator offers him a three-year internship. Despite accepting it, Doofenshmirtz is somewhat uncomfortable by the Regurgitator's imposing will and the declaring that the world is his nemesis. He is even more disgusted that the Regurgitator has no intention of keeping Perry trapped for long, but intending to kill him. Deciding that he has enough of this, Doofenshmirtz secretly plans in a escape button in Perry's trap and a couple of rocket boots and a self-destruct mechanism in the lair. When the Regurgitator learns about the escape button and self-destruct mechanism, he attempts to kill Doofenshmirtz, but Perry, having learned of this, presses the button to free himself and manipulates the control panel to have the Regurgitator sucked from his entrance tube into the sky. Perry would later use the rocket boots to transport himself and Doofenshmirtz out from the Regurgitator's lair before it explodes. Perry later gets a call from Major Monogram that Regurgitator has landed into the O.W.C.A.'s prison, so with the Regurgitator now defeated and imprisoned for good, Perry goes back to being Doofenshmirtz's nemesis and the Flynn-Fletchers' pet once again.
He is voiced by Clancy Brown, who had voiced many other villains and had previously voiced another Phineas and Ferb villain, the Smile Away Reformatory School Sergeant.