In the third film, it is revealed that 500 years ago, Oogway was once best friends and brothers-in-arms with a powerful general named Kai. When Oogway was badly wounded in an ambush, Kai carried him to a hidden Panda village where the pandas healed him through use of chi, later teaching him to use it as well. However, Kai wanted this power all to himself and tried to take the chi of the pandas, forcing Oogway to confront him. After a long and fierce battle, Oogway banished Kai to the Spirit Realm. Sometime after Oogway ascended there, Kai challenges him to a rematch, defeating him and using his chi to return to the mortal realm. The vengeful Kai then attempts to take the chi from everyone in China. After Kai is destroyed by Po in the Spirit Realm, Oogway reveals that he specifically chose Po as the Dragon Warrior due to his being a descendant of the pandas who helped him long ago in addition to being a worthy successor to carry on his legacy and alerted Li Shan (Po's biological father) that Po was alive. Oogway then tells Po that he is now a master of chi, giving him a jade staff he wielded previously, and tells him that if he wishes he can return to the mortal realm.