Scooby-Doo 3

Scooby-Doo 3 was a planned sequel to Scooby-Doo 2: Monsters Unleashed that was set to be the third installment in the live-action Scooby-Doo film series.

Plot
Unknown

Why It Was Cancelled

 * 1) The first two Scooby-Doo films were panned by critics, despite being box office hits.
 * 2) After the second film was released, Matthew Lillard said in an August 2004 interview that there wasn't going to be a third film.
 * 3) Co-creator Joseph Barbera died in December 2006 before he could have a hand in making a third film.
 * 4) Although the first two films were box office hits, Warner Brothers was disappointed with the box office returns of the previous films.

Results

 * The third film was permanently cancelled.
 * There was a made-for-TV film called Scooby Doo! The Mystery Begins with mostly new cast members as the human characters. The rest of the films following The Mystery Begins were released straight to DVD.
 * The series will be rebooted with an animated movie scheduled to be released in May of 2020 with writer Randall Green at the helm. However, it is currently unknown who will star in the film.

External link

 * Matthew Lillard says "No Scooby Doo 3"