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Freezon Crystals are a clear solid glass-like substance that have the ability to produce intense cold. Mumm-Ra conjured up the Freezon Crystals by sprinkling Arctic Salt and some ThunderCatnip into the magical waters of his cauldron. The Arctic Salt give the crystals are freezing properties while the ThunderCatnip acts as an attractant for the ThunderCats.
Once when the Lion-O, Panthro, and Snarf were searching for the Treasure of Thundera in the Caverns of Cold on New Thundera, Mumm-Ra sent Ma-Mutt to place a batch of the Freezon Crystals in the caverns. Lured by the smell of the ThunderCatnip, Lion-O and Panthro headed straight for the crystals and were frozen solid. While trying to free them, Snarf too got frozen solid, except for his tail, on which he had worn his Snarf Tail Mitten underneath his Thermal Catsuit.
Snarf then used his tail to place the Sword of Omens in Lion-O's hands and that allowed him to break free of the ice, free the other two ThunderCats and destroy the Freezon Crystals as well.