Jaga (a.k.a. Jaga the Wise) was Claudus ' closest adviser and head of the ThunderCat council. He took over as "Lord of the ThunderCats" when Claudus lost his eyesight. Jaga didn't realize he caused the untimely fate of Thundera when he cast the Sword of Plun-Darr into a chasm, but this caused the entire planet to self-destruct. He piloted the Royal Flagship on part of its journey to Third Earth , but perished in the act. He now guides Lion-O as a spiritual adviser, teaching him the use of the Sword of Omens and how to act and rule wisely.