Littlefoot's Adventures of SpongeBob SquarePants: Christmas Who? is the first upcoming Land Before Time/SpongeBob SquarePants crossover short film planned to be re-edited by Yru17. It is a prequel to the previous Land Before Time crossover films. It is unknown when the film will be shown on YouTube.
Littlefoot and his friends (along with Ash, Stan, Simba, and their friends) visit Bikini Bottom for the first time as Ash, Stan, Simba, and their friends help Littlefoot, SpongeBob, and their friends learn the meaning of Christmas.
- Ash Ketchum, Pikachu, Misty, Togepi, Brock, Stan Marsh, Kyle Broflovski, Eric Cartman, Kenny McCormick, Simba, Nala, Timon, Pumbaa, Zazu, and Genie guest star in this short film.
- This short film will be part of a double feature with Littlefoot's Adventures of Ghostbusters II (also guest starring Simba, Nala, Timon, Pumbaa, Zazu, Stan, Kyle, Cartman, Kenny, and Genie).
- This short film explains how Littlefoot and his friends learned about Christmas.
- The only guest ally of this short film not celebrating Christmas is Kyle Broflovski, since he is Jewish.
- Like Pooh's Adventures of SpongeBob SquarePants: Christmas Who?, this is an NTSC film with NTSC bits from The Land Before Time movies, the Pokémon movies, South Park: Bigger, Longer & Uncut, The Lion King movies, and the Aladdin movies.
- Littlefoot and his friends will celebrate Christmas again in Littlefoot's Adventures of The Nightmare Before Christmas.
- Littlefoot and his friends will celebrate Christmas with SpongeBob and his friends again in SpongeBob's Adventures of Winnie the Pooh: A Very Merry Pooh Year.
- This short film is a flashback adventure, so Littlefoot's grandparents are absent in this short film.