While looking for valuables in an abandoned tomb, two Bolkins (short sheep-faced beings) accidentally release a ghostly renegade named Grune. Stealing into the Cats' Lair, Grune drains the fortress of their power source Thundrillium and goes on to destroy a Wollo village and forge a mighty weapon from a fire-rock of Thundranium, a unique substance that weakens the Thundercats. Jaga appears to wage a final battle with Grune, having fought with him long before on the planet ThunDERa. Weakened by the Thundranium, Jaga is losing. Lion-O risks his life and projects all his strength into Jaga's failing form, tossing him the Sword of Omens. With this boost of Thundercat power, Jaga defeats the ghostly warrior, blasting Grune into nothingness. Jaga returns the Sword to Lion-O just in time for the Lord of the Thundercats to survive.

This episode can be found on

Disc 2

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