“The Lego Batman Movie” is this year’s only worthwhile story about a manic, self-obsessed, profoundly unloved cartoon billionaire who lives in an isolated fortress of his own design, resents the people that he’s entrusted to protect, and receives money from (executive producer) Steve Mnuchin. It is also arguably the most enjoyable Batman movie ever made, and certainly the funniest.

Neither of those are particularly high bars to clear, but Chris Mckay’s exuberant — and exhausting — new film is nevertheless a worthy spin-off of 2014’s “The Lego Movie,” grafting a warm-hearted parody of the Caped Crusader onto an animated franchise that’s as malleable as the plastic bricks for which it’s named.

The relentless pace and irreverently self-aware tone are clear from the very start, as Batman — voiced to gravelly perfection by Will Arnett — offers a running commentary on the various studio logos that precede his latest adventure (imagine “Deadpool,...