Developed by Rankin/Bass, based on the characters created by Tobin, "Ted", Wolf, ThunderCats was one of the most successful animation series in the 1980's. With three seasons totaling 130 episodes, the series tells the adventures of a group of humanoid felines surviving from the planet Thundera. On a new planet called the Third Earth, they face various threats, and their greatest enemy, the mummified demonic sorcerer Mumm-Ra. 

Lion-O is the leader of the ThunderCats. He is the owner of the Sword of Omens, a weapon that is used to call all Thundercats when they are in danger. The sword gives you "vision beyond reach", which allows you to see what is going on when a Thundercat in danger. In addition, it also releases rays, and possesses the powerful, "Eye of Thundera". The "Eye of Thundera", is a larger symbol that represents its motto of "Justice, truth, honor and loyalty." Lion-O also has the Claw Shield, which fits in his hand to be used as a shield but also can shoot claws that are connected to super resistant wires and can releases gases of various types. Lion-O was a child when he entered the escape ship in Thundera, but his suspended animation capsule that was supposed to slow his aging failed. Arriving in the Third Earth as an adult.