On
Christmas Eve, Lawrence and Linda are stuck at the airport waiting for Lawrence's parents to arrive from
England.
Phineas and
Ferb convert the top of their house into a large, extravagant
rest stop for
Santa Claus, complete with a
sauna, massage table, satellite TV, elliptical center to work off milk and cookies, milk and cookies, special
reindeer feeding center, and beard purifier. They urge everyone in Danville to help decorate the entire city for
Christmas and they follow, happily spreading cheer along the way.
Candace (who has sneered at the boys for still writing letters to Santa, declaring it childish), however, is busy trying to figure out the perfect present for her boyfriend Jeremy, and the song "What Does He Want" plays in the extended edition of the episode. Meanwhile,
Perry the Platypus sneaks off to attend a Christmas party his organization, OWCA is throwing. After receiving a Sal Tuscany
CD from his "
Secret Santa," he is given an emergency danger alert that
Dr. Heinz Doofenshmirtz is up to something nefarious. He darts off to the doctor's evil lair and is trapped in Christmas lights, topped off with a
partridge. Doofenshmirtz reveals that his uncle has sent him a special "Naughty-inator," a device that can ruin Christmas—his dilemma is that he simply does not dislike the holiday and is unsure if he should use it, but after carolers begin harassing him with "
We Wish You a Merry Christmas" (especially the part where they demand
figgy pudding and "won't go until [they] get some"), he activates the machine. The "Naughty-inator" causes the Naughty or Nice list at Santa's workshop in the
North Pole to brand everyone in Danville as "naughty," therefore canceling the holiday for the people of the town. Phineas, Ferb, and their friends are all completely distraught and decide to broadcast a song about why Danville should be branded "nice" to radios at the North Pole; two
elves receive the broadcast and decide to go down to the city to investigate what caused the mishap. Meanwhile, Candace continues to unsuccessfully try to get Jeremy to hint at his perfect gift, merely baffling the boy. The elves—named Blayn't and Clewn't—finally arrive in Danville and inform the boys that it appears that it is the city itself, not the people, that is "naughty" and they are unsure why. Doofenshmirtz, meanwhile, decides to put in Perry's Sal Tuscany CD in his
stereo and when Tuscany on the radio sings "Christmas cannot be destroyed, not even by a Naughtyinator!", the loud vibrations destroy the "Naughty-inator," causing Christmas cheer to return to Danville and removing the "naughty" brand from everyone. The elves inform the kids that it is too late to clear up the misunderstanding with Santa, meaning Santa cannot come to Danville. Phineas and Ferb, not ready to give up yet, see their opportunity to save the holiday and decide to create a flying sleigh, along with help from Blanyn't, Clewn't, Isabella, Baljeet, Buford and (amazingly) Candace to deliver presents made by the two elves at record speed to every house in the city. They almost fail at doing so, as it is too dark to see anything, and when one of the presents gets jammed in the "present cannon" Baljeet fixes it but in the process is shot out of the cannon and flies through the sky and down the chimney with the present into his friend's house where he gets his Christmas wish: a kiss underneath the mistletoe from a girl. Buford (who had been on the "Naughty" list) gets everyone in the city to turn on their Christmas lights, putting him on the "Nice" list in the process. They finally succeed and everyone in town gets a present. Meanwhile, Perry has managed to escape and wrap Doofenshmirtz in his own Christmas lights trap, causing him (to his delight) to finally have the ability to hate Christmas. When the gang return to the Flynn-Fletcher house, they find that Santa has come to the city and just finished using their rest stop. He thanks Phineas for taking care of deliveries for the city and flies off with the rest stop hitched to his sleigh. Doofenshmirtz, similarly, smashes the Sal Tuscany CD in rage and discovers that it is actually a gift from
Santa Claus himself, as "A Sal Tuscany" is an
anagram of Santa Claus, with "an embarrassing left over 'Y' at the end". This made Doofenshmirtz realize that Santa was the one who sent him the plans for the Naughty-inator as part of Santa's plan to grant Doof's wish of the ability to hate Christmas, though Doof actually sees it as a reason to celebrate the holidays, much to his delight. In a style similar to "
The Gift of the Magi", Candace sells her necklace that she was planning on trading for earrings to get Jeremy a new guitar and Jeremy sells his old guitar that he was planning on trading for a new one to get Candace the earrings she wanted. In the end, Lawrence and Linda finally return home with the children's grandparents, and everyone opens up their presents ... even Doofenshmirtz gets a present from Perry: his favorite almond brittle. == Cast ==