Aside from doubling the length of each episode, The New Scooby-Doo Movies differed from its predecessor by adding a rotating special guest star slot; each episode featured real-life celebrities or well-known fictional characters joining the Mystery, Inc. gang in solving the mystery of the week. Some episodes, particularly those guest-starring characters from The Addams Family, Batman, and Jeannie, deviated from the established Scooby-Doo format of presenting criminals masquerading as supernatural beings by introducing real ghosts, witches, monsters, and other such characters into the plots.
