Batman: Gotham by Gaslight is an atmospheric detective thriller with genuinely clever twists and a wonderfully crazy storyline written with immense skill.
Although Batman and Harley Quinn has great animation and some fun action beats, its weird sense of humor and flat story make this a dull outing for the Caped Crusader and company.
Batman Beyond: Return of the Joker is a stunningly crafted animated film brimming with personality, a deeply interesting story, and amazing vocal performances.
Batman: Mask of the Phantasm is one of the greatest Batman stories ever told. It's a stunning piece of animation with a story that is equal parts gripping and unpredictable.