If you loved Scooby-Doo! and the Samurai Sword, try Batman: The Doom That Came to Gotham
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.
You already loved

Scooby-Doo! and the Samurai Sword
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Batman: The Doom That Came to Gotham
What they share
Both films are directed by Christopher Berkeley, and they sit in Action / Animation / Fantasy / Mystery territory. If that's the register that drew you to Scooby-Doo! and the Samurai Sword, the second film will land in a comparable space — through a different lens.
What Batman: The Doom That Came to Gotham is
Gotham City winter darkness falls on a crumbling clock tower Ancient evil unleashed in dark alleys A dark knight era animated thriller unfolds