Jolly Good Day Scooby Doo! (2014 Animated Film)

Scooby and the gang head to London as they meet up with an old friend as they investigate the Dragon that King Arthur had slayed.

Characters:

 * Scooby-Doo (Frank Welker)
 * Shaggy Rogers (Matthew Lillard)
 * Fred Jones (Frank Welker)
 * Daphne Blake (Grey DeLisle)
 * Velma Dinkley (Mindy Cohn)
 * Pierce Gross (Daryl Sabara) - the gang's old friend
 * The Dragon (Dee Bradley Baker) - King Arthur had slain the dragon with the power of Excalibur
 * Suspects:
 * Mr. and Mrs. Carlston (Jeff Bennett and Kath Soucie) - a married rich couple, Emil Carlston is a stern business man who says no comment and Coco Carlston is a rich woman who has interest in Daphne's fashion sense, Reason: because of the Dragon Skin found in the closet.
 * Jason Evans (Phil Morris) - the Big Ben cleaner, he is stern and is very hesitant to warn the gang about the Dragon, Reason: because of the dislikes of the local legends.
 * Muriel Mason (Cindy Robinson) - a gothic British girl who knows a lot of sorcery, Reason: Because of her tablet that was found with Dragon Teeth.
 * Edgar Bryce (Robin Atkin Downes) - a skinny, yet slick investor who wants the tradable goods of London, he has 2 bodyguards at his side, Reason: because of his rememberance of the towers paths.

Clues:

 * Fake Dragon Skin
 * Claws that is from fossil molds
 * coal dust found on the windows of Carlston Manner

Culprits:

 * Pierce Gross (Daryl Sabara) - Reason: to make the Carlston's pay for cheating his family of their right to own the property.

Plot:
???