The BEST Episodes of ThunderCats Roar

Every episode ever - ranked by fan votes!

Last Updated: Sep 20, 2021

Network: Cartoon Network

Staying true to the premise of the original series: Lion-O and the ThunderCats — Tygra, Panthro, Cheetara, Wilykat and Wilykit — barely escape the sudden destruction of their home world, Thundera, only to crash land on the mysterious and exotic planet of Third Earth. Lion-O, the newly appointed Lord of the ThunderCats, attempts to lead the team as they make this planet their new home. A bizarre host of creatures and villains stand in their way, including the evil Mumm-Ra, Third Earth’s wicked ruler who will let nothing, including the ThunderCats, stop his tyrannical reign over the planet.

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Driller

#1 - Driller

Season 1 - Episode 5 - Aired Mar 7, 2020

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 gonna break everything!

star 8.27
11 votes
Writers: Bryan Condon, Joan Ford
Snarf's Day Off

#2 - Snarf's Day Off

Season 1 - Episode 26 - Aired May 16, 2020

Snarf leaves the Cats' Lair to get a needed vacation by transforming into a normal cat and hanging out with a nice old lady on a farm! But his relaxing day is threatened.

star 8.25
8 votes
Directors: Keith Pakiz
Writers: Joan Ford, Justin Becker
Mumm-Ra of Plun-Darr (2)

#3 - Mumm-Ra of Plun-Darr (2)

Season 1 - Episode 28 - Aired May 23, 2020

Chaos reigns over Third Earth now that the Mutants and Mumm-Ra control the Cats' Lair! The Thundercats' only hope is to sneak back in and get a super secret weapon Panthro has hidden at the heart of the Lair.

star 8.17
6 votes
Writers: Bryan Condon, Joan Ford
Berserkers

#4 - Berserkers

Season 1 - Episode 17 - Aired Apr 18, 2020

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

star 8.10
10 votes
Adopt a Jackal

#5 - Adopt a Jackal

Season 1 - Episode 20 - Aired Apr 25, 2020

After a battle with the Mutants, Jackalman gets confused and accidentally returns to the Cats' Lair with the Thundercats.

star 8.00
7 votes
Directors: Keith Pakiz
Writers: Bryan Condon, Joan Ford
Lion-S

#6 - Lion-S

Season 1 - Episode 25 - Aired May 16, 2020

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! Looks like the ThunderCats have a new best friend! Maybe even, a new ThunderCat?????

star 8.00
7 votes
Directors: Jeremy Polgar
Writers: Cait Raft, Joan Ford
Secret of the Unicorn

#7 - Secret of the Unicorn

Season 1 - Episode 6 - Aired Mar 7, 2020

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.

star 7.91
11 votes
Writers: Ben Crouse, Joan Ford
Dr. Dometone

#8 - Dr. Dometone

Season 1 - Episode 14 - Aired Apr 4, 2020

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

star 7.88
8 votes
Writers: Joan Ford, Justin Becker
Prank Call

#9 - Prank Call

Season 1 - Episode 4 - Aired Feb 29, 2020

Lion-O wants to prove to the ThunderKittens that he's not just some boring old adult, like Tygra, even if it means ignoring his instincts and messing with an obviously evil crystal.

star 7.85
13 votes
Directors: Jeremy Polgar
Writers: Marly Halpern-Graser, Victor Courtright
Mumm-Ra of Plun-Darr (1)

#10 - Mumm-Ra of Plun-Darr (1)

Season 1 - Episode 27 - Aired May 23, 2020

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!

star 7.83
6 votes
Writers: Bryan Condon, Joan Ford
The Horror of Hook Mountain

#11 - The Horror of Hook Mountain

Season 1 - Episode 10 - Aired Mar 21, 2020

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.

star 7.80
10 votes
Jaga History

#12 - Jaga History

Season 1 - Episode 18 - Aired Apr 18, 2020

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.

star 7.80
10 votes
Writers: Ben Crouse, Joan Ford
Thunderslobs

#13 - Thunderslobs

Season 1 - Episode 11 - Aired Mar 28, 2020

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

star 7.78
9 votes
Writers: Ben Joseph, Joan Ford
Safari Joe

#14 - Safari Joe

Season 1 - Episode 22 - Aired May 2, 2020

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!

star 7.78
9 votes
Directors: Jeremy Polgar
Writers: Joan Ford
Summer Fun Day!

#15 - Summer Fun Day!

Season 1 - Episode 21 - Aired May 2, 2020

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, giant, clawed humanoids that fight anyone who steps on their sand! Looks like summer fun day might involve some fighting!

star 7.75
8 votes
Writers: Joan Ford, Justin Becker
Ratar-O

#16 - Ratar-O

Season 1 - Episode 23 - Aired May 9, 2020

The ThunderCats have gotten so good at defeating the Mutants of Plun-Darr that it's basically become routine. That all changes with the arrival of the Mutants' old leader: Ratar-O, wielder of the Sword of Plun-Darr! Uh-oh!

star 7.75
8 votes
Directors: Keith Pakiz
Writers: Bryan Condon, Joan Ford
 Working Grrrl

#17 - Working Grrrl

Season 1 - Episode 12 - Aired Mar 28, 2020

After losing a race to Monkian over who gets to be leader of a local village, Cheetara becomes a successful business person. However, the other Thundercats discover Monkian cheated by drinking a super-speed potion. Now, with the help of Cheetara's biggest fan, Jan-Jan, they need to dethrone Monkian from his seat of power.

star 7.70
10 votes
Writers: Joan Ford
Mandora -- The Evil Chaser

#18 - Mandora -- The Evil Chaser

Season 1 - Episode 13 - Aired Apr 4, 2020

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

star 7.70
10 votes
Directors: Jeremy Polgar
Writers: Cait Raft, Joan Ford
The Legend of Boggy Ben

#19 - The Legend of Boggy Ben

Season 1 - Episode 3 - Aired Feb 29, 2020

Lion-O has gotten a hold of the last jar of Thundersnaps, the best cookies Thundera had to offer! But a difficult to open cookie jar is gonna send Lion-O and Cheetara chasing down a legend, a Boggy Ben-related legend.

star 7.65
17 votes
Writers: Victor Courtright
Barbastella

#20 - Barbastella

Season 1 - Episode 19 - Aired Apr 25, 2020

While flying with his new invention, Panthro hits it off with new friend Barbastella, the Queen of the Bats.

star 7.63
8 votes
Directors: Jeremy Polgar
Writers: Joan Ford
Exodus (1)

#21 - Exodus (1)

Season 1 - Episode 1 - Aired Feb 17, 2020

After the destruction of their home planet Thundera, the titular ThunderCats fly off to a new home, only to crash land on Third Earth after being shot down by their arch-enemies, the Mutants. Following a scuffle with the Mutants, Lion-O pursues them into the wild while the rest of the ThunderCats meet the Berbils whose village their ship unknowingly destroyed in the crash. Luckily, the Berbils are quick builders and opt to build their base while warning them of Mumm-Ra. Lion-O ends up encountering Mumm-Ra when chased by the Mutants to the villain's pyramid, with Mumm-Ra destroying the Mutants' ship before returning to his lair.

star 7.60
25 votes
Writers: Joan Ford, Victor Courtright
Lost Sword

#22 - Lost Sword

Season 1 - Episode 9 - Aired Mar 21, 2020

Lion-O is reminded that he needs to plug the Sword of Omens into the Cats' Lair each night or else the base will run out of power. That's fine, it's not like Lion-O's going to accidentally lose the sword or anything. Right?

star 7.60
10 votes
Study Time

#23 - Study Time

Season 1 - Episode 15 - Aired Apr 11, 2020

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.

star 7.56
9 votes
Writers: Bryan Condon, Joan Ford
Mumm-Ra, The Ever-Living

#24 - Mumm-Ra, The Ever-Living

Season 1 - Episode 16 - Aired Apr 11, 2020

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.

star 7.56
9 votes
Directors: Jeremy Polgar
Writers: Joan Ford, Lesley Tsina
Warrior Maiden Invasion

#25 - Warrior Maiden Invasion

Season 1 - Episode 8 - Aired Mar 14, 2020

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.

star 7.40
10 votes
Writers: Joan Ford, Molly Knox Ostertag