The ThunderCats are on the move! After the kingdom of Thundera is attacked by the lizard people, Lion-O leads Tygra, Cheetara and the other heroes on a quest for the Book of Omens and the magic stones of legend. But he'll have to face villains like Mumm-Ra, the ancient evil sorcerer, and Slithe, the dangerous lizard general. Luckily, he has the Sword of Omens and its amazing powers at his disposal. ThunderCats, ho!
Cast: Will Friedle, Matthew Mercer, Satomi Koorogi, Emmanuelle Chriqui, Kevin Michael Richardson, Madeleine Hall, Eamon Pirruccello, Corey Burton, Robin Atkin Downes, Dee Bradley Baker, Clancy Brown
In the season finale, Mumm-Ra's forces find the ThunderCats and the Tech Stone in Avista City. An incredible battle ensues for the stone as Lion-O finds himself betrayed by a trusted ally.
The ThunderCats' search for the Tech Stone leads them high above Thundera to the floating bird city of Avista, where the stone is the power source for their city.
While trying to uncover the location of the next stone, the ThunderCats cross paths with a mad man, Soul Sever, who is trying to insert the souls of his long-lost family into machines.
When Mumm-Ra unleashes the deadly Sycorax upon them, the ThunderCats must turn to an unlikely savior: a snake oil salesman named Ponzi whose potion is the only thing that repels the beast. Ponzi also provides Lion-O some helpful romantic advice as he begins to pursue Pumyra.
Seduced by the fun-loving lifestyle of Tookit and the orphans they meet, WilyKit and WilyKat are tricked by Tookit into becoming thieves again.
As Lion-O and Pumyra try to evade Mumm-Ra and his forces in the mines of Mount Plundarr in an effort to keep the Sword of Plundarr out his hands, we flash back in time and discover its origin ... and its relationship with the Sword of Omens.
The ThunderCats must infiltrate the mines of Mount Plundarr where Ratar-O is holding Cats as slaves. They learn the legend of the Sword of Plundarr, which they must retrieve.
The Thundercats discover a cat refugee, Pumyra, being forced to fight as a gladiator in a city of Dogs.
Wilykit and Wilykat are forced to hunt for their food, but something is hunting them.
Tygra and Lion-O come upon a lost tiger village and in it they find Tygra's real father. But all is not as it seems....
Pleading for a chance to save his friends, Jaga grants Lion-O life until sunrise to try and save his friends ... and stop Mumm-Ra.
During an ambush, Lion-O falls to his death, but he is given a second chance at life - if he can pass a series of trials that pit him against each of his teammates.
The ThunderCats go on the offensive, but Mumm-Ra won't see his lizard army crushed so easily. He tasks Slithe with recruiting two new and vicious Generals.
Tygra and Lion-O enter the Astral Plane to retrieve the stone, but encounter Mumm-Ra in the process. Grune and Panthro have their final duel. Cheetara finally chooses her beau.
Lion-O and Tygra take on Mumm-Ra in a battle for the Spirit Stone in the Season 1 finale.
Sent by the Elephants to the Forest of Magi Oar, Lion-O must learn to master Sight Beyond Sight before returning to the Elephant Village. The Cats encounter a group of paper warriors with a dark secret.
The Cats track the first stone's location to the mystical Elephant Village, but the forgetful Elephants can't remember where it is.Lion-O must learn to use Sight Beyond Sight.
Tiny robot bears solicit the help of the ThunderCats to save them from a slave trader who values their technical and construction skills.
As Tygra and Panthro work on the ThunderTank, Lion-O is searching for supplies and encounters a mysterious Drifter who helps teach a few important lessons. After showing off The Sword of Omens in town, Lion-O is challenged by a man known as The Duelist and must overcome himself in order to win.
As the Thundercats relax outside the Tower of Omens, Lion-O thinks the Book of Omens is tech rather than magic. He attempts to power it up, and is zapped and meets Jaga's essence inside. He travels back in time in the form of his ancestor named Leo to find out what happened generations ago.
The ThunderCats continue their quest for the Book of Omens, which leads them to the fabled Tower of Omens. However, they will first have to get past a series of deadly traps in order to reach it. Meanwhile, Mumm-Ra grows tired of waiting and forces Jaga to reveal the Book's location, and plans to go there himself to take it at all costs.
The ThunderCats accompany Panthro to Cloud Peak Mine to search for Thundrilium for the Thundertank. Along the way, Panthro and Grune's past is explored, from their first encounter to the reason behind Grune's betrayal.
While Slithe and the lizard army hunt the Thundercats, they take refuge in a huge brier patch where the meet the Petalars, a race of flowering beings that despite living a short time, teach Lion-O a thing about life.
After escaping their destroyed city with the Sword of Omens, the team encounters the Fishmen, who sail the quicksand sea in search of a massive sea creature. The ThunderCats’ quest is to find the Book of Omens … but Lion-O is more interested in revenge on Mumm-Ra.
An unforeseen betrayal by a former comrade brings destruction upon the Cat Kingdom. While King Claudus leads the fight against General Slithe and his lizard army, the evil sorcerer Mumm-Ra attempts to seize the Sword of Omens.
Lion-O struggles with his destiny to become the next King of Thundera, as chosen by the Sword of Omens. Meanwhile, festivities are held to celebrate General Grune's return to the Cat Kingdom.