The ThunderCats series was developed by Rankin/Bass, based on characters created by Tobin “Ted” Wolf. It was one of the most successful animated series of the 1980s, with three seasons totaling 130 episodes. The series tells the adventures of a group of anthropomorphic felines who survive from the planet Thundera to a new planet called Third Earth, facing various threats and their greatest enemy, the mummified demonic sorcerer Mumm-Ra.

Lion-O is the leader of the ThunderCats and wields the Sword of Omens, a weapon used to summon all ThunderCats when they are in danger. It provides “sight beyond sight” to see what is happening to a ThunderCat in danger, additionally unleashing beams and possesses the powerful “Eye of Thundera,” a larger symbol representing his motto: justice, truth, honor, and faith. He also has the Lassy Shield, which is worn on the arm and used as a shield, throws claws connected by ultra-durable wires, and releases various types of gases.