Whenever Lion-O found himself in trouble, he would hold up the Sword of Omens and say the quote that appears on this t-shirt, "Thunder! Thunder! Thunder! ThunderCats, Hooooooo!" The Sword's power stems from the Eye of Thundera, which is embedded in its hilt. When Lion-O let out his battle cry, the ThunderCats proved that nothing can stop the them once they have all joined forces!