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 and fans alike, despite being box office hits.
 * 2) Joseph Barbera died a few years after Scooby-Doo 2 was released in theaters.
 * 3) After the second film was released, Matthew Lillard said in an August 2004 interview that there wasn’t going to be a third film.

Results

 * The film was permantly 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 2020 with writer Randall Green at the helm.

External link

 * Matthew Lillard says "No Scooby Doo 3"