by Will Friedle) – The leader/Lord of the ThunderCats. The biological son of King Claudus, Lion-O was a misunderstood teenager in Thundera, being the only one in the kingdom who believed that technology and Mumm-Ra existed. Because of his beliefs, many felt he was unworthy to become king, often favoring his adopted older brother, Tygra, for the position. After the fall of Thundera and the death of King Claudus, Lion-O becomes the new Lord of the ThunderCats, leading the team to find a way to defeat Mumm-Ra. Even though Lion-O can be a bit of a hot-head, he's by far the most patient and understanding cat of the team. Lion-O also believes that the other races of Third Earth should be treated equally, as seen when Lion-O was defending two persecuted Lizards from some Thunderians. He wields the Sword of Omens, a powerful mystical weapon. Tygra (voiced by Matthew Mercer) – The adopted older brother of Lion-O. Originally, Tygra was the crown prince of Thundera but as Lion-O was born, he couldn't succeed his adoptive parents as the ruler of Thundera (he's still a prince, next in line for the throne after Lion-O). This resulted in Tygra hating his brother for things beyond Lion-O's control, such as losing the crown and their mother, who had died giving birth to Lion-O. Tygra constantly worked to show that Lion-O wasn't worthy to succeed Claudus as the King of Thundera. Tygra also possesses extreme xenophobia, a jealous streak, and both an inferiority and a superiority complex, all of which often cause friction between the two brothers. Tygra is adept at many weapons, though typically defaults to using his bullwhip. Cheetara (voiced by Emmanuelle Chriqui) - One of the last remaining cleric warriors. Cheetara initially served as a mentor to Lion-O, since she never shunned him for his interests in technology and initially seems to support his kindness to other races. Being a cheetah as well as a cleric, she has immense speed and deft agility which is often used in combat. Both Lion-O and Tygra have an interest in her but she ultimately chooses to be with Tygra since the two share a deeper bond. Lion-O later comes to accept them being together. Panthro (voiced by Kevin Michael Richardson) - One of King Claudus' most loyal soldiers. Panthro, along with his friend, Grune, were originally sent by Claudus to find the Book of