Thundercats Wiki
Origin Thundera
Group ThunderCats
Weapons & Accessories
Weapons Sword of Omens, Claw Shield
Accessories Red Cloak
Voice Actor
Voiced by Larry Kenney
Character Guide
Page List of all characters

For the article about the 2011 version of this character, see Lion-O (2011).

Lion-O is the main protagonist in the ThunderCats cartoon series. He is the hereditary "Lord of the ThunderCats", a title that he inherited form his father and previous Lord of the ThunderCats, Claudus.

Lion-O was only a young boy of twelve years when he was forced to flee his home planet of Thundera and leave everything behind. As the imminent destruction of Thundera drew near, Jaga the wise gathered all the ThunderCats including Lion-O and they escaped the planet in the Royal Flagship just moments before Thundera exploded.

On board the ship, Jaga teaches Lion-O all about the "Code of Thundera" as well as the legendary Sword of Omens and the Eye of Thundera contained within it. During the flagship's long journey to Third Earth, Jaga instructs all the ThunderCats to enter into the Suspension Capsules to slow down their aging process. However, some fault with Lion-O's Suspension Capsule results in his aging not being slowed down substantially and by the time the flagship reaches Third Earth (a span of ten galacto-years), Lion-O had physically grown into an adult.

Having missed the entire growing process of going from childhood to adulthood, Lion-O slowly obtains knowledge and wisdom from the other ThunderCats and his allies and friends during the course of the ThunderCats' adventures.

ThunderCats Bullet Point.png Strengths[]

Lion-O is physically very strong, almost as strong as Panthro. He is capable of lifting and moving heavy objects like rocks and machinery. Like all the other ThunderCats, Lion-O also possesses great agility which he uses to his advantage in battles.

Apart from his physical attributes, Lion-O is also very brave and virtuous. He is ready to face any danger when defending his friends and allies.

Lion-O is also quite intelligent, often using his wits to trick his enemies into submission and stopping their evil schemes. He often prefers to avoid violence when trying to solve any problems or diffuse any threats.

ThunderCats Bullet Point.png Weaknesses[]

Lion-O's lack of maturity is his biggest weakness. Due to his still child-like mind, Lion-O can be impetuous at times and often acts in haste and anger without properly thinking about the consequences. Also his curiosity often makes him end up in trouble. Like all ThunderCats, Thundrainium has a severely weakening effect on Lion-O as well.

The image of Thundera exploding is one that often haunts Lion-O. It is a memory that has left a deep impact on him and his greatest fear as well.

ThunderCats Bullet Point.png Weapons and Equipment[]

Lion-O carries with him the legendary Sword of Omens which contains the Eye of Thundera, the source of the ThunderCats' powers. With his sword, Lion-O is able to counter almost any weapon that his enemies may attack him with. The sword also allows Lion-O to summon his friends as well as give him "Sight Beyond Sight" and warn him if any of his friends are in danger.

Lion-O also owns the Claw Shield which he carries on his waist. This gauntlet is extremely strong and capable of blocking any sort of enemy fire. The Claw Shield also shoots out Claw Lines which help Lion-O to climb over obstacles.

The young lord is also a substantially good driver and often can be seen driving the ThunderTank.

ThunderCats Bullet Point.png Quotes[]

  • "Remember Jaga saying, "It's wise to save your money, and to spend it carefully, but greed can destroy you". - The Tower of Traps
  • "You made a mistake, but mistakes can be valuable if you learn from them". - The Ghost Warrior

ThunderCats Bullet Point.png Appearances[]

Lion-O is the only character to have appeared in all 130 episodes of ThunderCats. Even though in some episodes he was not the main focus of the story, he nevertheless was always present.

ThunderCats Bullet Point.png Original Concept Design[]

ThunderCats Bullet Point.png Merchandise[]

The following toys and figures based on the character were produced by various Toy companies

LJN and affiliate companies[]

Lion-O Series 1 MOC.jpg
Rainbow Toys LionO.jpg
Macplay Lion-O MOC.jpg
LJN Lion-O Rainbow Toys Lion-O Playful Lion-O Macplay Lion-O
Grand Toys Lion-O MOC.jpg
Childbro Toys LionO.jpg
MOC Glasslite Lion-O.JPG
Grand Toys Lion-O Childbro Lion-O Otto Simon Lion-O Glasslite Lion-O
Cosmocats LionO.jpg
Cosmocats Lion-O

Bandai Toys[]

Bandai Lion-O 6 inches Box.jpg
Bandai Lion-O 8 inches Box.jpg
Bandai Lion-O 8 inches SDCC Box.jpg
Bandai Classic Lion-O 8 inches STGCC Box.jpg
6" Lion-O 8" Lion-O 8" SDCC


Kidworks LionO MOC.jpg
Kidworks Lion-O Unitoys Lion-O Glasslite Miniature Lion-O Papeleria Francesa Lion-O
Funko POP! Vinyl Figure Lion-O - 001.jpg
ThunderCats Classics Minimates Series 1 - 002.jpg
Funko POP! Lion-O Minimates Lion-O


HH Lion-O.jpeg
PCS Lion-O.jpg
IH Lion-O.jpeg
Hard Hero Lion-O Pop Culture
Shock Lion-O
Icon Heroes Lion-O

ThunderCats Bullet Point.png Gallery[]

ThunderCats 1980s
Good Characters Lion-O | Tygra | Panthro | Cheetara | Wilykit | Wilykat | Bengali | Pumyra | Lynx-O | Jaga | Claudus | Thunderian Guard | Jagara | Torr | Snarf | Snarfer | Berbils | Willa | Nayda | Snowman | Turmagar the Tuska | Dr. Dometone | Mandora | Hachiman | Quick-Pick | Wizz-Ra | Captain Bragg | Screwloose | Mumm-Rana | King Arthur | Merlin | Maftet | Micrits | Under-earthmen | Brodo | Sondora | Kudi | Char | Ecology Inspector | Terrator | Wollos | Bolkins | Brutemen | Cavemen | Molemen | Gomplin | Giants | Scooper Jaga Nav2.png
Characters Good Characters | Evil Characters | Creatures
ThunderCats Episode Guide | Characters | Locations | Weapons | Vehicles | Cast and Crew | VHS & DVDs | Literature | Merchandise

Shows ThunderCats 1980s | ThunderCats 2011 | SilverHawks | TigerSharks