Watch ThunderCats Roar

The Thundercats' worst nightmare comes true when their worst enemies, Mumm-Ra and The Mutants, team up after Mumm-Ra acquires The Sword of Plun-Darr!

Hey everyone, it's Snarf's monthly day off! That's right, this episode follows Snarf as he leaves Cats' Lair to get a needed vacation, by transforming into a normal cat and hanging out with a nice old lady on a farm!

Lion-O is happily playing with Snarf in their "Frolicking Field" and doesn't have a care in the world, unfortunately he's accidentally stomping all over the miniature village of the Micrits!

Lion-O and the other ThunderCats are thrilled to meet a brand new Thunderian: Lion-S! She's cool, good at fighting robots and, most importantly, thinks Lion-O and his Sword of Omens are really neat and interesting!

While minding her own business, Cheetara is caught in a trap set by Safari Joe, the famously annoying hunter! After escaping, she rallies the other ThunderCats to help her stop Joe once and for all, by turning the tables and capturing him!

The Thundercats are exhausted from fighting bad guys all the time so Lion-O suggests they spend a relaxing summer fun day at the beach, with no fighting! Unfortunately the beach is home to the Crabmen, who fights anyone on their sand!

After a battle with the Mutants, Jackalman gets confused and accidentally returns to the Cats' Lair with the Thundercats (he is the dumbest mutant). Jackalman pretends to be a Thundercat so his enemies won't catch him and the Thundercats pretend to play along because they feel bad for him!

While flying with his new invention, Panthro hits it off with a new friend – Barbastella, the Queen of the Bats! Now Panthro needs help getting ready for his big date with her – because it turns out Panthro is terrified of bats! Lion-O and Cheetara are happy to help but… wow, that is a lot to unpack!

Jaga, the ghost of the ThunderCats' mentor, visits the Cats' Lair after being freed from the Astral Plane and explains why their home world of Thundera exploded.

When the Cats' Lair is attacked by gold-loving robot pirates, Lion-O and the ThunderKittens ditch their chores to fight the robo-pirates.

Every time Mumm-Ra gets ahold of a magic artifact to restore his powers, the ThunderCats just smash it and turn him into a dinky skeleton again. Until today that is, because Mumm-Ra just remembered he's got the Ancient Spirits of Evil on his side.

Lion-O never pays attention during Tygra's training sessions! So when he's asked to do a pop quiz on "sword magic", he accidentally opens a portal to the Astral Plane and releases the Nether Witch on Third Earth.

Lion-O is tasked with mapping the beaches of Third Earth, which leads to him somehow draining the oceans of all their water entirely.

Lion-O "accidentally" releases a whole space prison full of criminals and winds up on the wrong side of the law.

Cheetara is the fastest living being in the universe, until Monkian beats her in a race! Now Cheetara has to find something else to be the best at, while the rest of the ThunderCats find out how Monkian got so darn fast!

Tygra's feeling unappreciated by the other ThunderCats so he starts hanging out with Mumm-Ra and cleaning his Black Pyramid?! Whaaaaaaat?

Tygra takes Lion-O climbing up the peak of Hook Mountain to teach him a lesson about trust. But when they get trapped by a snowstorm and take refuge in a creepy cabin owned by the creepy Snowman - it's Tygra's ability to the trust that's gonna be tested.

Third Earth is being overrun by super tough, super buff Warrior Maidens and it looks like the ThunderCats are next on their hit list! It's gonna be up to the ThunderKittens to save the day even though the kittens are so small and the Warrior Maidens are so big.

Vultureman has got a brand new invention but there's one big problem: he stole the idea from Panthro! Oh, also Vultureman is using his invention to take over Third Earth. So, there are two big problems.

A crying unicorn appears at the Cats' Lair and weepily tells the ThunderCats that all of her unicorn friends have been captured! Tygra thinks he's just the unicorn expert to help the last of the unicorns – He just needs her to stop sobbing long enough to tell him who took her friends. Easier said than done, pal.

Panthro is getting a little fed up with having to fix things around the Cats' Lair constantly, which is unfortunate because the ThunderCats are about to be attacked by an unstoppable drilling robot – and he's going to break everything!

Lion-O has gotten ahold of the last jar of Thundersnaps – the best cookies Thundera had to offer! But a difficult to open cookie jar sends Lion-O and Cheetara chasing down the legend of Boggy Ben.

Fleeing the destruction of their home planet Thundera, Lion-O and the ThunderCats land on the mysterious, dangerous, all-around awesome world of Third Earth! But their enemies, the Mutants of Plun-Darr have followed them and it turns out Third Earth already has a Mumm-Ra problem – can Lion-O learn the ropes of being a leader in time?

Fleeing the destruction of their home planet Thundera, Lion-O and the ThunderCats land on the mysterious, dangerous, all-around awesome world of Third Earth! But their enemies, the Mutants of Plun-Darr have followed them and it turns out Third Earth already has a Mumm-Ra problem – can Lion-O learn the ropes of being a leader in time?