The kids' school is being haunted by a ghost named Walter Winthrop III. Although he's an adult, it seems that Walter never graduated from school because he could never focus in class and failed his final exam. Walter wants to take classes to help him finally pass his final exam, so Martin sets up a ghost school in his attic to teach Walter so he can graduate.
Sign in to join the discussion — comments are spoiler-gated to your watch progress.
Discussion starters
