The second installment of the Scooby-Doo franchise was called "The New Scooby-Doo Movies". Unlike it's predecessor, "Scooby-Doo, Where are You?", this series was an hour long and featured special guest stars. Each week real-life celebrities (sometimes voiced by the actual celebrity) or fictional characters (often characters from other Hanna-Barbera produced cartoons) joined Scooby and gang in their mystery solving escapades. These special guests were the best part of the show. but some were better then others. Here is a list of the guests from this series.
The Harlem Globetrotters
Two E pisodes
Batman and Robin
Two Episodes with Joker and Penguin as the villains
The Three Stooges