Dr. Heinz Doofenshmirtz is the main villain from the Disney Channel animated series Phineas and Ferb; he is a mad scientist and head of Doofenshmirtz Evil Incorporated. He tends not to be evil in the traditional sense, but rather overly dramatic, eccentric and generally clueless. He constantly attempts to wreak havoc across "the entire Tri-State Area", but all of his plans tend to be thwarted by his nemesis, Perry the Platypus.
In the series' Christmas special, Phineas and Ferb Christmas Vacation!, he plots to ruin Christmas for the rest of Danville by convincing Santa Claus that everyone in the city is naughty, using his newest device, the Naughtyinator. However, the flaw in his plan is that, unlike most other villains, he doesn't hate Christmas and has no real reason to want to destroy it. He even confides to Perry that what he truly wants for Christmas is the ability to hate Christmas.
Doofenshmirtz is soon given a reason to activate the Naughtyinator when he gets a visit from a group of carolers singing "We Wish You a Merry Christmas" and demanding he bring them some figgy pudding. Annoyed with their request, Doofenshmirtz activates the Naughtyinator and seems to succeed in his plan, but it does not stop the carolers from their song. Surprisingly, he finds that he does have some figgy pudding and gives it to the carolers. After they leave, Doofenshmirtz plays a CD that Perry brought with him, and turns up the volume so loud that it ends up destroying the Naughtyinator, thwarting his plan. After Perry traps the doctor in the trap he used on him earlier, Doofenshmirtz curses that he hates Christmas, and then suddenly realizes he got exactly what he wanted.
Over the end credits, Perry pays Doofenshmirtz a visit on Christmas Day to exchange gifts. Perry gives him some almond brittle, and Doofenshmirtz gives him a vase.