Doraemon & TMNT: Heroes Unite!

Doraemon & TMNT: Heroes Unite!, also known in Japan as Doraemon & TMNT: Hīrōzu danketsu! (ドラえもん＆TMNT：ヒーローズ団結！) is a one hour made-for-television film of the anime series Doraemon, that features characters from the Teenage Mutant Ninja Turtles franchise.

Synopsis
When Doraemon's latest gadget causes the Teenage Mutant Ninja Turtles to lose their ninjutsu abilities, Splinter must teach Doraemon and friends ninjutsu to save New York from the Shredder.

From Doraemon:

 * Doraemon
 * Nobita/Noby
 * Shizuka/Sue
 * Gian/Big G
 * Suneo/Sneech
 * Dorami
 * Dekisugi/Ace
 * Tamako/Tammy

From Teenage Mutant Ninja Turtles:

 * Leonardo
 * Donatello
 * Raphael
 * Michelangelo
 * Splinter
 * April O'Neil
 * Shredder
 * Fishface