Showbiz must be treating former Get Smart agent Don Adams badly — he's been reduced to running the Adams Extermination Company. When he's sent to Horror Hill to eliminate the vermin from horror actor Lorne Chumley's mansion, the gang helps out, unaware of the dangers that lie within.

Answering the cries of The Mamas and the Papas singer Cass Elliot, the gang find themselves trying to unmask the green globs who are running amok in her candy factory.

The Harlem Globetrotters and Scooby and his friends are hijacked to a haunted island for an experience they will never forget.

Scooby-Doo and the gang, along with the rock group Josie and the Pussycats, battle ghosts haunting the Dixie Queen Showboat on the Missouri River—or is it the "eerie" canal?

The gang takes a trip to the carnival to escape their ghost-chasing troubles, only to find Dick Van Dyke owns and operates the park.. .which is haunted.

While visiting Velma's former school, the gang runs into Tim Conway, who's coaching there. Now it's up to them to unmask the ghost of a former athlete who's running amok...

When the gang runs into Jeannie and Babu, they end up making a detour to Persia to stop an evil djinn.

The Mystery Machine breaks down and the gang find themselves running into Speed Buggy and his friends. It's up to the two gangs to discovery the mystery of the winds that blow through the town that they've been stranded in.