Finding a missing cat seems like a simple enough case for the Mystery, Inc. gang, until the search leads them into an abandoned puppet factory. There's something a little creepy about these mechanical moppets. For starters, they talk and walk all by themselves! Scooby and Shaggy are no dummies; when a giant dragon puppet attacks, they know it's time to split! But can the gang close the case before the puppets close in on them?