Principal Deedle, A.K.A The Dark Specter", is the hidden main antagonist of the 2009 Scooby-Doo movie, Scooby-Doo! The Mystery Begins. He was the former of Coolsville High School and Shaggy's former friend.
He was portrayed by Shawn Macdonald.
His costume was a black cloak with a white mask. While's he not in disguise he wears a brown suit with a bow tie.
The Mystery Begins
Deedle used the Dark Specter disguise to scare his students away while he searched for a rare stamp called the "Erie Misprint" that is buried in a time capsule below his school with the help of two real ghosts named Prudence Prufrock and Ezekial Gallows. However Fred Jones, Daphne Blake, Velma Dinkley and Shaggy Rogers were blamed for his plans and were suspended then later expelled from Coolsville High. With the help of Scooby-Doo, they later returned, cleared their names, and defeated Deedle. After his evil plan has been foiled it was presumed he was taken to prison for his actions and he also lost his job as the principal. Then Vice Principal Grimes becomes the new principal and unexpells Fred and the gang for falsely accusing them and declares them as heroes.