A Fairly Odd Christmas, on Nickelodeon
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This is the sequel to Grow Up, Timmy Turner! It aired in 2012, but I didn't get Nick at the time, so I didn't see it until 2020 (on Hulu). I watched it on Christmas in July.

Okay, long story short, Santa Claus is upset because kids are disappearing from his "nice list," because Timmy has been using his fairies to grant their wishes, so they no longer need Santa. So he sends a couple of elves, Christmas Carol and Dingle Dave, to bring Timmy to the North Pole (along with Tootie, Wanda, Cosmo, and Poof), to talk to him about it. And Mr. Crocker sneaks a ride with them, wanting to get his name off the naughty list. While at Santa's workshop, a wish Timmy makes to help Santa accidentally leads to Santa getting amnesia (so throughout the movie, we see him thinking he's all sorts of different characters, starting with the Easter Bunny). This means Timmy will have to take Santa's place this year. But it turns out he can't do that, because Timmy himself is on the naughty list. So Timmy and his friends (and Crocker) have to travel to the home of Elmer the Elder Elf (Tony Cox), the keeper of the naughty list, in the hopes of getting Timmy's name off the list, so he can save Christmas. And I don't know what else to say, except that one of the minor elves in the movie was played by Dalila Bela, whom I know from Odd Squad. Anyway, the whole movie is redonkulous, but kind of okay, I guess.

Followed by "A Fairly Odd Summer"