Costume Craze has your ThunderCats costumes! Dress up in a Lion-o costume, Panthro costume, or choose from our selection of deluxe ThunderCats masks. Complete your costume with the mighty Sword of Omens! The ThunderCats are cat-like humanoid aliens from the planet Thundera, forced to flee to the distant Third Earth. ThunderCats are on the loose! Perfect for your next costume party, ThunderCats costumes are not just for Halloween!