Thundercats is an animated television series that first aired in 1985. The show follows a group of cat-like humanoid aliens from the planet Thundera who escape to Third Earth after their home is destroyed. The main characters include Lion-O, the leader, and his companions, who battle the evil sorcerer Mumm-Ra and other villains to protect their new home. The series is known for its action-packed adventures and themes of friendship, bravery, and teamwork. It features a mix of science fiction and fantasy elements, with each character possessing unique abilities and weapons, such as Lion-O's Sword of Omens, which grants him special powers.