In 1988, a detective becomes obsessed with a series of murders that seem to defy explanation.

Ravaged by the loss of Scooby-Doo in a snowmobiling accident, the Mystery Inc. gang must reunite one final time to plan the funeral and solve one last mystery.

A magician with a mysterious secret lives alone with his jaguar, Shadow, in the Spooky House, an old mansion rigged with magic tricks and hidden chambers.