If you loved Scooby-Doo! Shaggy's Showdown, try Scooby-Doo! and the Curse of the 13th Ghost
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.

Scooby-Doo! Shaggy's Showdown

Scooby-Doo! and the Curse of the 13th Ghost
What they share
Theyboth carry the cozy, playful mood tags, and they sit in Animation / Comedy / Family / Mystery territory. If that's the register that drew you to Scooby-Doo! Shaggy's Showdown, the second film will land in a comparable space — through a different lens.
What Scooby-Doo! and the Curse of the 13th Ghost is
Cursed seaside carnival, autumn’s last chill. A locked chest rattles in the ruins of a funhouse, its handle frozen mid-turn. The gang uncovers a half-solved disappearance tied to a ghost they should have locked away. When the thirteenth specter slips free, the old case stirs. Needless nostalgia isn’t always a curse—see early Guillermo del Toro cartoons.