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Tai Lung
A mighty snow leopard, and master of kung-fu, who was Shifu's former student. He was originally trained by Shifu to be the Dragon Warrior. However, when Oogway denied him the Dragon Scroll, Tai Lung ravaged the Valley of Peace, leading him to be defeated and sent away to prison for 20 years.
After breaking out of jail, he now looks to exact revenge against Shifu and Oogway for imprisoning him, as well as to kill the current Dragon Warrior for taking his title away from him.
From Kung Fu Panda.