Superman: Doomsday
If you are a fan of both the classic 1940's and the 1990's Superman Cartoons this is a must see. An added bonus is the addition of little nods to both series throughout the movie including one of the Mechanical Monsters all the way up to Brainiac 1.0 skull and other "memoribillia". My only complaint is that at times Superman looks like he has a Mullet.