Scooby-Doo! Mystery Incorporated - Season 1 - Eps 18: The Dragon's Secret
When an exchange student named Mai Le comes to Crystal Cove, she draws the affection of Shaggy. A dinner party hosted by the Blake Family is interrupted by the Red Wizard warning to stay away from the Dragon's Heart which he has sworn to protect at all cost. Later, Mai Le and the gang to come under attack by a White Wizard who is after Mai Le's ring, and the Red Wizard comes to the gang's rescue, but he is too late to save the ring. The Red Wizard turns out to be Mr. Chen, the owner of Chen's Internet Cafe and Tea House. He reveals that with the White Wizard, now in possession of all four rings, is able to open the Jade Dragon's Heart, which is a priceless ruby. Will the gang solve the mystery or is everything not as it seems?
About Scooby-Doo! Mystery Incorporated

Title: Scooby-Doo! Mystery Incorporated
First Air Date: 2010-07-12
Last Air Date: 2013-04-05
Status: Ended
Rating: 8.223/10 (from 1018 votes)
Language: EN
Seasons: 2
Total Episodes: 52
Network: Cartoon Network
Genres: Animation, Mystery, Family
Production Companies: Warner Bros. Animation
Synopsis
This incarnation of the popular cartoon series finds Scooby and the gang living in Crystal Cove, a small town with a long history of ghost sightings, monster tales and other mysteries ripe for the sleuths to solve once and for all. But the longstanding Crystal Cove residents, who bank on the town's reputation to attract tourists, are prepared to do what it takes to protect their turf.
Cast

Frank Welker
Scooby-Doo / Fred Jones (voice)

Grey DeLisle
Daphne Blake (voice)

Mindy Cohn
Velma Dinkley (voice)

Matthew Lillard
Norville 'Shaggy' Rogers (voice)