Scooby and Shaggy struggle to reincarcerate thirteen of the foulest demons ever to plague the earth after they accidentally release the demons from a chest.

Mordor the Malevolent lures the gang into his evil forest in hopes of destroying the only ones who could jeopardize his new-found freedom.

While at a paranormal convention, the gang is chased by the evil Reflector Spectre and his henchmen, Weerd & Bogel (the two comic ghosts from the premiere episode). It's up to the gang to capture the ghost and solve the mystery of the disappearance of a maid who was taken into the Spectre's mirror world by mistake.

Zomba, the host of the "Spine Tingler Movie," is one of the escaped demons who sweeps the gang into their TV, where they are trapped in an old Frankenstein movie.