Lion-O is a Cat of average build with cream and gold colored fur, spiky red hair, blue/teal eyes, pointed ears, small, elongated fangs and a striped face. His attire consists of armor on his shoulders, torso, and hips; with dark blue pants, needed to be held up by a large belt, and lastly, he has shin guards. Like all ThunderCats, he has no shoes.

First appearance | The Sword of Omens
Voiced by | Will Friedle
Name | Lion-O
Gender | Male
Species | Cat
Race | Lion
Affiliation | ThunderCats
Weapon(s) | Sword of Omens
Family | [[1]] (Ancestor),Claudus (Father),Tygra (Adoptive Brother),THE Queen
Status | Lord of the Thundercats
For the 80's incarnation look here.

The current Lord of the ThunderCats, Lion-O is a fearless leader who's ready to jump into the fight, even when it gets him in trouble. He wields the mighty Sword of Omens, the most powerful weapon on Third Earth.

About Lion-OEditEdit

The current Lord of the ThunderCats, Lion-O is a fearless leader who's ready to jump into the fight, even when it gets him in trouble. He wields the mighty Sword of Omens, the most powerful weapon on Third Earth.


Although cunning and skilled in combat, Lion-O can also be a bit of a hothead. He was the only one at the beginning to believe that technology and Mumm-Ra exists. Lion-O will immediately step up to defend anyone in need, regardless of their species, proclaiming, "No one deserves to be treated like that". His compassion won the help of one of the Lizards while he and Tygra were being held prisoner. This trait was also what causedCheetara to think of him as different, since no one else would do what he did. Sometimes Lion-O's big heart gets the best of him

In the beginning, Lion-O tended to be a sort of ladies man, first when trying to sound mature when meeting Cheetara the first time, then later pretending to be checking out some local female Thundarians during his training with the Sword of Omens, much to his father's chagrin.

In Song of the Petalars, Lion-O was obviously very annoyed when Snarf jumped on his face when he was having a chat with Cheetara "Are you kidding me!? Now!? This had BETTER be important, Snarf!". Despite this, he can also be quite nervous when Cheetara does the advancing, as seen in Journey to the Tower of Omens.

Lion-O, at the start of the series, showed some resentment towards Tygra for his father's favoritism towards him, wanting a chance to prove himself just as worthy of being succeeding his father as everyone else believed Tygra to be. His beliefs, however, put him at odds with his father who had a very different ideology concerning how to lead the ThunderCats.



Tygra and Lion-O were siblings from a very early age. As Tygra was adopted into the family before Lion-O was born, he and Lion-O are seen to have an on and off rivalry. Sometimes Lion-O would show resentment towards his older brother, due to Tygra's jealousy over the crown and favoritism by Claudus, as he was able to out do Lion-O in many things. During one time, as kittens both he and Tygra were visiting the forbidden ruins, where Tygra would purposely push Lion-O into a pit, but instantly regretted it and went to find help, showing the bond they both have as siblings. When entering the Astral Plane, their relationship became more complicated and Lion-O, having heard of Anet's prediction that he would feel betrayed by Tygra, was much more cautious, but instead he and Lion-O resolved their differences. However the betrayal, unintentionally, was from not Tygra alone but Cheetara as well. Lion-O was shocked, when he saw Cheetara and Tygra kissing. Lion-O tried to hide his heartbreak, but ultimately couldn't, which led to some tension between him and the new couple. When Lion-O "died" Tygra was made King in his place, but he soon started to see just how much pressure the position carried and ultimately gained a new found respect for his younger brother. In "Native Son", it was made clear that despite their rivalry, Lion-O still views Tygra as a brother and would do anything thing to help. At the end of that episode, when Tygra asked if he was doomed to lose everyone he cared about, Lion-O comforted him by saying "You're not gonna lose me brother",to which Tygra gave a smile.


Cheetara first met Lion-O, while he was visiting the slums, they developed a close freindship together and overtime she became guide and counselor to him. She called him different, stating that there was a reason on why theSword of Omens chose him, and shared his compassion for other animals. Lion-O than began to develop feelings for her but unbeknownst to him she held deep feelings for Tygra. One time, Cheetara actually kissed Lion-O on the cheek, (though it was only for support). Lion-O was shocked, when he saw Cheetara and Tygra kissing. While trying to feel happy for them, Lion-O couldn't shake the angry feeling of being mislead by Cheetara from all their seemingly tender moments.


Claudus was Lion-O's Stern and loving father. He did not approve of Lion-O's beliefs in technology and would question Lion-O's judgement and duties as prince, always hoping he would be more like Tygra. Sometimes Claudus would openly show his favor of Tygra over Lion-O, but in the end he loved Lion-O very dearly. At the time of Thundera's downfall and Claudus's death, his last words to Lion-O and Tygra were "No matter what happens, you've made me proud today".


  • Will Friedle is a very vocal ThunderCats fan. The original show is one of the reasons he got a job in animation in the first place.
  • Friedle is best known for voicing Batman/Terry McGinnis in Batman Beyond, Ron Stoppable in Disney's Kim Possible, Blue Beetle/Jaime Reyes in Batman: The Brave and the Bold and Doyle Blackwell in The Secret Saturdays.
  • Likely one of the most noticeable differences between the two incarnations of Lion-O in eye colors. Lion-O'swere red/brown in the original series while this version his eyes are teal.
  • He sometimes says "Whiskers" as a curse word when he or the others are in trouble.