If you loved Scooby-Doo and the Alien Invaders, try Scooby-Doo! and the Witch's 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 and the Alien Invaders

Scooby-Doo! and the Witch's Ghost
What they share
Both films are directed by Jim Stenstrum, and they both 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 and the Alien Invaders, the second film will land in a comparable space — through a different lens.
What Scooby-Doo! and the Witch's Ghost is
A crisp October evening in New England, the lone lamp on the dock flickers. A gang in colorful van and a talking dog arrive to find a writer’s gothic mansion glowing under a blood moon. A spectral crone with green fire trails over the salt marsh. The gang must separate real ghosts from stagecraft while a folk-rock band sings the witch’s lost anthem. A puppet show’s scarecrow dances one step too far. Like Don Knotts trapped in a Halloween special.