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.
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Ready to Watch The 13 Ghosts of Scooby Doo, Season 1, Episode 4?