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When Lion-O goes after it, he finds himself face to face with a man of the mountain whom he must fight. Mumm-Ra is hatching a plot to release an ancient princess who has the power to mesmerize males with her gaze.Ī meteor of pure Thundrillium crashes into the remote Hook Mountain.
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The Bolkins, Wolos and Berbils urge the ThunderCats to help them against this powerful foe. Grune knows of the ThunderCats and reveals an ancient and storied past with Jaga. While searching for treasure inside an ancient tomb two Bolkins, Bundun and Hurrick, accidentally release the ghost of the evil Grune the Destroyer. Mandora the Evil Chaser is introduced and Lion-O assists her in trying to recapture the convicts encountering the Living Ooze and the subterranean Mudhogs along the way. Lion-O finds what looks like a spaceship's escape pod, he opens it and inadvertently releases the galactic convicts Quickpick, Burnout and Plutar. Mumm-Ra and the Mutants then capture Willa the Warrior Maiden in an effort to use the Sword and destroy the ThunderCats. Tygra is drugged and used against his fellow ThunderCats to steal the Sword of Omens. After following them, he runs into Mumm-Ra, who has disguised himself as a flower named Silky. Tygra chases a giant worm underground and encounters the Molemen. Wilykat becomes a prisoner locked up in a tower as Lion-O and Wilykit must find their way to him through a maze of booby traps, set by a mysterious being known as Baron Karnor. Wilykit and Wilykat meet a traveling Wolo and then go in search of a piece of stolen jewellery.
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Lion-O meets the Unicorn Keepers and then sets out to free Snarf from his captors. Snarf is captured after freeing a unicorn from the pirate Hammerhand and his Berserkers who are out hunting for food. Mumm-Ra disguises himself as a Thunderian named Pumm-Ra, and claims to have rescued Cheetara from the mutants in order to infiltrate the now completed Cat's Lair.
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Lion-O also takes the ThunderTank for a short-lived joyride, whilst Tygra looks for Thundrylium in a strange cave and begins to age at an accelerated rate. Willa, of the Warrior Maidens is introduced, and she and her sister, Nadya, manage to fight off Monkian but both of them are cautious of the new arrivals (i.e. The Mutants are looking for a "feminine touch" around Castle Plun-darr and attempts to capture natives of the 3rd Earth. After learning more about the Brute Men from the Berbils, Tygra tells the twins to stay behind, as the adult ThunderCats rush off to free these peaceful creatures. The Cats Lair is nearly complete when an agitated Wilykit and Wilykat rush home to tell the other ThunderCats that the Mutants have enslaved a race of creatures called Brute Men to build their new fortress, Castle Plun-darr. They soon learn that the Berbils are being frequently attacked by the Trolligs who steal their fruit to give to the Giantorrs. Later, Lion-O and Snarf are taken prisoner by a band of small robotic bears named Ro-Bear Berbils, lead by Ro-Bear Bill and Ro-Bear Belle. Panthro introduces the ThunderTank, saving the others from a meteor shower conjured by Mumm-Ra that buries the remnants of the ThunderCats' ship. With the young Lord of the Thundercats in sight, Lion-O is about to face his toughest enemy yet.
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While exploring Third Earth, the Mutants ship, piloted by Slithe, Monkian and Jackalman, is brought down by a mysterious black pyramid which is the home to Mumm-Ra, an evil demon who is willing to form an alliance to capture the Eye of Thundera. With the others forced into sleep capsules, Jaga must pilot the ship for the world known as Third Earth and Lion-O, just a young boy, must learn what it means to become a man and Lord of the Thundercats as he learns to wield the power of the Sword of Omens. Their journey changes when an enemy force known as the Mutants attack and leaves their ship severely crippled. The ThunderCats must find a new home after their home planet, Thundera, explodes. This is only a problem in the second half of the season, and especially affects the five episodes which comprise the mini-series "Lion-O's Anointment", which are split up throughout the season, when the stories featured are supposed to occur on consecutive days. At times, the order used below causes these to be presented out of order. Although there is little in the way of major continuing storyline running through ThunderCats, certain creatures reoccur and clips from other episodes are employed. However, neither this order nor the original production order of the episodes is the correct chronological story order for the first season. The Toonami order of the first season differs from the original broadcast order, which is the order used for the DVD release of the series. The list below presents the episodes in the order that they aired on Cartoon Network's Toonami programming block.
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