The Trials of Lion-O (Part 1).The ThunderCats are ambushed by Slithe who is now assisted by Kaynar and Addicus. When Lion-O is knocked into the river and pinned down by the rocks, he finds himself in the spirit world where Jaga tells him that he must pass a bunch of tests in order to return to the living. The first test taking place in the simulation of Thundera's slums has Lion-O trying to figure out which Wilykit and Wilykat has the key to pass to the next test.