Littlefoot's Adventures of The Secret of NIMH is an upcoming Land Before Time/Don Bluth film which is planned to be re-edited by Yru17. It will appear on Vimeo in the near future.
Littlefoot, Cera, Ducky, Oliver, Petrie, Spike, Chomper, Rudy, and Guido, (along with Tarzan, Spongebob, Stan, Aladar, and their friends) and Introducing Grandpa Longneck, and Grandma Longneck, went on a journey to meet Mrs. Brisby, who lost her husband and had kids. On this adventure in the Rose Bush, they meet Justin, who tells Mrs. Brisby about NIMH coming to the farm, and face to face with evil Jenner, whom Oogie Boogie Shenzi, Banzai, Ed, Pete, The Grand Duke of Owls, Plankton, Yzma, Clayton, Creeper, The Machine, Ichy and Dil, The Fratellis, Maleficent, Cassidy, and Butch, work for, to rescue Mrs. Brisby's family.
- Tarzan, Jane Porter, Professsor Archimedes Q. Poter, Terk, Tantor, SpongeBob SquarePants, Patrick Star, Squidward Tentacles, Sandy Cheeks, Eugene Krabs, Stan Marsh, Kyle Broflovski, Eric Cartman, Kenny McCormick, Aladar, Neera, Plio, Yar, Zini, Suri, Baylene, Eema, Url, Tom, and Jerry, AnnaBelle, Taran, Princess Eilonwy, Fflewddur Fflam, Gurgi, Orddu, Orgoch, and Orwen, The Flying Dutchman, Jesse Greenwood, Elvis, Randolph Johnson, Nadine, Basil of Baker Street, Dr.David Q.Dawson, Olivia Flaversham, Kuzco, Pacha, Kronk, Mickey Mouse, Donald Duck, Goofy, Jedi, C-3PO, R2-D2, Aisling, Darth Vader, Boba Fett, The Goonies (Mikey Walsh, Brand Walsh, Mouth Devereaux, Data Wang, Chunk Cohen, Andy Carmichael, Stef Steinbrenner, and Sloth Fratelli), Scooby-Doo, Shaggy Rogers, Fred Jones, Daphne Blake, Velma Dinkley, Slimer, Stay Puft, Jack Skellington, Oogie Boogie, The Machine, Lchy, and Dil, Yzma, Shelldon J. Plankton, Ratigan, Fidget, The Fratellis (Ma Fratelli, Francis Francis Fratelli, and Jake Freatelli), Creeper, Maleficent, Pete, Clayton, The Grand Ducke of Owls, Team Rocket (Cassidy, and Butch), guest star in this film.
- This is the first Land Before Time/Don Bluth crossover films to guest star Simba, Nala, Timon, Pumbaa, King Julien, Maurice, Mort, Terk, Tantor, Louis, Sebastian, King Louie, Rutt, Tuke, and Roger Rabbit. Genie still does not guest star with the Jungle Adventure Crew in a Land Before Time/Don Bluth film until Littlefoot Meets Anastasia.
- This is also the first time Simba, Nala, and the rest of the Jungle Adventure Crew join Timon and Pumbaa in a crossover film with a film about mice as all Lion King crossovers with films about mice or rats only feature Timon and Pumbaa (with the exception for Timon and Pumbaa's Adventures of Ratatouille, features Sebastian as a guest star).
- The only reason why most of the Jungle Adventure Crew are guest starring in this film is because Genie is the only member of the crew to guest star in Bloom Discovers The Secret of NIMH.
- Like BrerDanielMovie93's film Pooh's Adventures of The Secret of NIMH, this will be an NTSC film, with NTSC bits from The Land Before Time movies, The SpongeBob SquarePants Movie, South Park: Bigger, Longer & Uncut, The Nightmare Before Christmas, Pocahontas 1 and 2, Free Willy 1-3, The Goonies, The Black Cauldron, the Scooby-Doo movies, the All Dogs Go to Heaven trilogy, The Princess and the Frog, and more.
- Although Jesse is portrayed as a 14-year-old teenager in this film, right before Sullivan throws a dagger at Jenner's back, Jesse is in his younger voice being dubbed as Daniel LaRusso from The Karate Kid (although Littlefoot and the gang have yet to meet him in Littlefoot's Adventures of The Karate Kid) shouting "BEHIND YOU!".
- Both Itchy and Jeremy were voiced by the late Dom DeLuise.
- The Land Before Time, All Dogs Go to Heaven, and The Secret of NIMH were directed by Don Bluth.