There's been all manner of cartoon movies featuring Son of Krypton and Bat of Gotham in various forms and canonicities, but only one of them has had a proper theatrical release. That's Batman: Mask Of The Phantasm, and it's as good as you'd expect from a film jumping off from the landmark Batman: The Animated Series. You know the drill; looks great (even if it is a puffed up TV movie), is well written and boasts an incomparable voice cast. And, going back into Batman's origins without just doing a beat-for-beat retread of the basic story, it's an intriguing introduction to the stellar cartoon world. The only real downside is the mystery about who's behind that mask, which is a problem Batman stories have faced in all forms; when introducing a villain with a mysterious identity, due to the size and distinction of Batman's Rogue's Gallery it's either going to be the one major new character introduced (Hush) or a pre-existing character in a new form (Arkham Knight). In Phantasm it's the former, and the twist is patently obvious from very early on. Thankfully there's enough to the very-Gotham crime story elsewhere to make it interesting elsewhere.