Selome Hailu editorDreamWorks animation announced that Julia Stiles, Marcus Scribner, Aimee Garcia, Ashley Liao, Lauren Tom, Keston John, Justina Machado and D’Arcy Carden have been cast in “Dragons: The Nine Realms,” which premieres on Hulu and Peacock on Dec. 23.They join Jeremy Shada, who stars as Tom Kullersen in the “How to Train Your Dragon” spinoff.