S1·E25 Renewal

Dr. Jenkins, Jason and Tann host a surprise 15th birthday party for Kong complete with a giant birthday cake. That night, Lua leads Kong out into the jungle where she uses a Primal Stone to open a Portal into another dimension and takes Kong and herself into a parallel world version of Kong Island. Jason and Tann follow. Kong is forced by the other world's Shaman/Judge to undergo a series of tests to see if he is worthy to be the Protector of Kong Island. Kong encounters Ominous and an evil version of himself that attempt to enrage him and divert him from his quest. When his friends are threatened by a titanic tidal wave, Kong abandons his test to rescue them. The Shaman announces that Kong is worthy and returns them all to their own Kong Island.