Source: https://kungfupanda.fandom.com/wiki/Kai_(Kung_Fu_Panda_3)
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Kai, also known as Kai the Collector and General Kai is the main antagonist in Kung Fu Panda 3. He was a warrior and the general of an army, which he led alongside his brother-in-arms Master Oogway.

Kai fought alongside Oogway as best friends, but after he learned how to steal the chi of others, Oogway banished him to the Spirit Realm. Five hundred years later, he returned to the mortal realm as a Spirit Warrior and sought to steal the chi from every kung fu master and destroy Oogway's legacy. With the help of his jombies, he nearly accomplished his goal, but he was eventually defeated and destroyed by Master Po Ping.