A Phineas and Ferb Family Christmas

The boys decide to put on a traditional family Christmas special featuring their family, friends and a few very special guests, including Kelly Clarkson.

Songs

 * Let it Snow, Let it Snow, Let it Snow
 * Good King Wenceslas
 * We Wish You A Merry Christmas

End Credits
A repeat of the second, third and fourth verses of Let it Snow, Let it Snow, Let it Snow.

Ferb's Line
(Sings in We Wish You A Merry Christmas)

Perry's entrance to his lair
He enters into his lair and Monogram tells him that Carl is acting as an extra in a Christmas special and sends him to stop Doofenshmirtz.

During the passage "We wish you a Perry Christmas" of We Wish You a Merry Christmas, Perry enters the lair when Monogram and Carl end their line. He starts decorating the lair in a Christmas-style, and after the last "We Wish You a Perry Christmas" he makes his chattering sound and gives a little smirk at the camera.

Background Information

 * "A Phineas and Ferb Family Christmas" features songs from the Phineas and Ferb Holiday Favorites album – Let it Snow, Let it Snow, Let it Snow by Isabella, the Buford and Baljeet rendition of Good King Wenscelas, and the whole gang singing We Wish You a Merry Christmas.
 * This episode is also referred to as "Phineas and Ferb's Family Christmas Special".
 * More of Isabella's family is shown in this episode, including Nana Shapiro ("Lotsa Latkes").
 * This episode happened sometime in July.
 * This episode is sometimes paired with "S'Winter".
 * Isabella wore the most winter outfits than all of her other winter episodes combined.
 * It is possible the line "12th annual Phineas and Ferb family Christmas" reveals Phineas and Ferb are twelve years old.
 * Isabella's hair style is different during the second verse of Let it Snow, Let it Snow, Let it Snow.
 * It is revealed that Irving plays the French horn.
 * This is the first episode that Dan Povenmire directed in Season 3, not counting Phineas and Ferb The Movie: Across the 2nd Dimension.

Production Information

 * This episode aired on Disney Channel (US) on December 2, 2011 right before the premiere of the Disney Channel Original Movie Good Luck Charlie, It's Christmas and right after a special rerun of "Phineas and Ferb Christmas Vacation!".

International Premieres

 * December 4, 2011 (Disney Channel Brazil and Latin America)
 * December 26, 2011 (Disney Channel Spain)

Errors

 * Isabella came to the door with Phineas and Ferb to see Kelly Clarkson but after Phineas says "Oh, that's too bad. We'll have a seat, we'll have someone else sing.", she wasn't there.
 * When Major Monogram is singing his part of We Wish You A Merry Christmas, Carl can be seen wearing his Christmas Sweater but when it zooms out, Carl is seen wearing his regular clothes again.
 * Before Isabella starts singing "Let It Snow", it is daytime. While she is singing, it is nighttime, but during the last verse and in the rest of the episode, it is daytime.
 * During the last line of "Let It Snow", Isabella is wearing mittens with her outfit, but when she forms a "heart" sign over the Phineas silhouette on the window screen, she has no mittens on, but is wearing them again in the next scene. She could've taken her mittens off to form the "heart" sign. And throughout the song, her outfits change.
 * When Irving is playing the French horn, his glasses are green. (This may not be an error. Irving may be wearing green glasses to fit in with the holiday theme.)
 * Perry dodges a plant at Doofenshmirtz evil incorperated which he assumes is mistletoe, however, mistletoe berries are actually white, not red, so he most likely dodged holly.

Continuity

 * This is the second Christmas episode of the series, but the first to be only 11 minutes long. The first was "Phineas and Ferb Christmas Vacation!".
 * This is the third time the boys do something to cool off. Previously were in "Lawn Gnome Beach Party of Terror" and "S'Winter".
 * Isabella wears the same clothes that she wore in "S'Winter".
 * Phineas says that this is the best Christmas ever, in the same way that Doofenshmirtz said in "Phineas and Ferb Christmas Vacation!".
 * Carl salutes again like in "Swiss Family Phineas" and "Undercover Carl".
 * Nana Shapiro from "Lotsa Latkes" reappears.
 * Carl takes part of one of Phineas and Ferb's ideas again ("Undercover Carl")
 * Doof mentions that he likes brittle ("Phineas and Ferb Christmas Vacation!"; "Phineas and Ferb The Movie: Across the 2nd Dimension")

Allusions

 * This episode appears to parody the concept of the Christmas variety special, a once-common concept for Christmas specials at the time which featured performances and appearances by celebrity guests and musicians.

Cast

 * Vincent Martella as Phineas Flynn
 * Ashley Tisdale as Candace Flynn
 * Thomas Sangster as Ferb Fletcher
 * Caroline Rhea as Mom
 * Alyson Stoner as Isabella Garcia-Shapiro
 * Maulik Pancholy as Baljeet
 * Mitchel Musso as Jeremy Johnson
 * Dan Povenmire as Dr. Doofenshmirtz
 * Jeff "Swampy" Marsh as Major Monogram
 * Richard O'Brien as Dad
 * Bobby Gaylor as Buford Van Stomm
 * Dee Bradley Baker as Perry
 * Tyler Alexander Mann as Carl
 * Kelly Clarkson as Herself