The gang tries to clear their names by investigating the ghosts at the school, but Shaggy and Scooby-Doo end up being locked in the cafeteria freezers. The stamp-collecting Principal Deedle decides to close the school, but Vice Principal Grimes deems it a prank and suspends the quartet as he refuses to believe that there are ghosts in the school. A third ghost, The Specter, appears, demanding everyone to leave. Two ghosts suddenly appear and chase them to the gym where a pep rally is taking place. They bond somewhat over a shared interest in mysteries, but quickly get on each other's nerves. Because of the fight on the bus and the damage to Grimes' car, Shaggy is sent to the library for detention, along with three others: Fred Jones, the quarterback of the football team Velma Dinkley, a science nerd and Daphne Blake, a wealthy drama club student. Later, Shaggy tries to smuggle Scooby onto the school bus, but a fight between Shaggy, Scooby, and some bullies breaks out which causes the bus to crash into a flagpole, which falls on Vice Principal Grimes' car, smashing its windshield. The two quickly bond and Shaggy adopts Scooby. Scooby panics and runs away, ending up in the bedroom of Norville 'Shaggy' Rogers, a clumsy and geeky outcast. Seeking shelter from a thunderstorm, he comes across a graveyard where he witnesses two ghosts rise from their graves. Later, on the way back to the pound, Scooby is accidentally left behind. Scooby-Doo is up for adoption, but nobody wants him. In Coolsville, Ohio, a pet adoption fair is held. Its sequel, Scooby-Doo! Curse of the Lake Monster, was released on October 16, 2010. The film is dedicated to Lorena Gale, who died during production. The music is scored by Academy Award-nominee David Newman, who had previously scored the theatrical films Scooby-Doo (2002) and Scooby-Doo 2: Monsters Unleashed (2004). Scooby-Doo was created using computer-generated imagery and his voice is provided by Frank Welker, who also was a cast member of the animated series, Scooby-Doo, Where Are You! and The Scooby-Doo Show, providing the voice of Fred, and has been the voice of the titular dog since What's New, Scooby-Doo?. The live-action cast features Robbie Amell as Fred, Kate Melton as Daphne, Hayley Kiyoko as Velma and Nick Palatas as Shaggy. gang met and the events of their first case. It is the third installment and the first prequel to the Scooby-Doo live-action film series, revealing how the Mystery Inc. The film aired on Cartoon Network on September 13, 2009, and later released on Septemon DVD and Blu-ray. Scooby-Doo! The Mystery Begins (also known as Scooby-Doo 3 or Scooby-Doo 3: The Mystery Begins) is a 2009 American made-for-television horror comedy film directed by Brian Levant, produced by Warner Premiere and distributed by Warner Home Video.

Scooby doo the mystery begins