Dragonheart: A New Beginning (2000)

One day, when he was a Matong of the monastery, he accidentally discovered a secret: there was still an extinct dragon, so Geoff and the dragon named Derek became friends. At this time, Master Guan and Lian from China revealed the secret of the dragon. it turns out that when the double-tailed comet returns, an ancient evil force will use the dragon's heart to control mankind. Derek passed the test of Master Guan and proved that there was no evil in his nature, so Master Guan began to train Derek to breathe fire and ice, ready to deal with the forces of evil, but the really terrible secret was revealed at this time.