Monster High: Gotham Ghouls

Monster High: Gotham Ghouls is a fan-made TV special that is a crossover of Monster High and Batman made by Universal, Mattel, and Warner Bros.

Plot Summary
Join Frankie Stein and the Ghouls as they travel to a place even more freaky and fabulous than Monster High; Gotham City! But it's not all fun and games as the Ghouls' old nemesis, Van Hellscream has teamed up with The Joker, Penguin, Riddler and the rest of Gotham's vilest villains to frame the Ghouls for a crime they didn't commit! Luckily, the Ghouls are befriended by Damien Wayne, the rebellious son of Batman and Catwoman and The Gotham Group, led by Hailey Quinn, the kind hearted, sane daughter of The Joker and Harley Quinn. Can Frankie, The Ghouls, and their new friends save Gotham City from the treacherous Van Hellscream?

Trivia

 * Kevin Conroy, Mark Hamill and Arleen Sorkin reprise their roles as Batman, The Joker and Harley Quinn, while Scott Wagner (famous as the voice of Aladdin in the film of the same name) does the voice of Damien Wayne.
 * This special marks the return of Van Hellscream and Ms. Crabgrass, first seen in Fright On!