Warner Bros.
From :

On Dec. 25, 1993, it truly was Christmas with the Joker.

That day marked the theatrical release of Warner Bros.’ Batman: Mask of the Phantasm, an animated film with the voice talent and art deco design of the Batman: The Animated Series. It overcame a rushed production, a nearly non-existent marketing campaign and it’s director losing her job title midway through to become what’s now considered one of The Dark Knight’s finest film entries.

Read the Full Story