If you loved Batman: Return of the Caped Crusaders, try LEGO DC Comics Super Heroes: Justice League - Cosmic Clash
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.

Batman: Return of the Caped Crusaders

LEGO DC Comics Super Heroes: Justice League - Cosmic Clash
What they share
Both films are directed by Rick Morales, and they both carry the playful mood tag, and they sit in Action / Adventure / Animation / Family territory. If that's the register that drew you to Batman: Return of the Caped Crusaders, the second film will land in a comparable space — through a different lens.
What LEGO DC Comics Super Heroes: Justice League - Cosmic Clash is
The universe finally gets collector's edition packaging. Brainiac plots to shrink and archive Earth like a lost episode of a cancelled 90s cartoon. The Justice League must shrink to save the day, again. A rare animated entry that remembers the hero usually steals the show from the villain.