The BEST episodes of ThunderCats (2011)

Every episode of ThunderCats (2011) ever, ranked from best to worst by thousands of votes from fans of the show. The best episodes of ThunderCats (2011)!

After Thundera is attacked by the lizard people, Lion-O leads the ThunderCats on a quest for the Book of Omens, the one artifact that could guide them to victory. But he'll have to face villains like the ancient evil sorceror Mumm-Ra and the dangerous lizard general Slithe. Luckily, he has the Sword of Omens and its amazing powers at his disposal.

Last Updated: 1/15/2023Network:Cartoon Network
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Omens (1)
star
8.38
1081 votes

#1 - Omens (1)

Season 1 - Episode 1 - Aired 7/29/2011

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.

Watch Now:AmazoniTunes
Legacy
star
8.34
773 votes

#2 - Legacy

Season 1 - Episode 7 - Aired 9/2/2011

Lion-O's soul is transported into the Book of Omens and he sees what life was like in the eyes of his ancestors as they start a rebellion against Mumm-Ra and discovers the origins of the Sword of Omens and the Warstone, which takes on the familiar shape of the Eye of Thundera during the course of events Lion-O is made to experience in his ancestor's body. Lion-O also learns from Jaga that in order to defeat Mumm-Ra, he must first find the remaining three Warstones that are scathered on Third Earth and unify the rest of the animals to create an army.

Writer: Todd Casey
Watch Now:AmazoniTunes
Birth of the Blades
star
8.27
361 votes

#3 - Birth of the Blades

Season 1 - Episode 21 - Aired 5/12/2012

Mumm-Ra arrives at Mount Plun-Darr and battles the Thundercats in an attempt to regain the Sword of Plun-Darr.

Watch Now:AmazoniTunes
What Lies Above (2)
star
8.27
406 votes

#4 - What Lies Above (2)

Season 1 - Episode 26 - Aired 6/16/2012

The ThunderCats must stop Mumm-Ra from getting the Tech Stone!

Watch Now:AmazoniTunes
Omens (2)
star
8.22
425 votes

#5 - Omens (2)

Season 1 - Episode 2 - Aired 7/29/2011

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.

Writer: Tab Murphy
Watch Now:AmazoniTunes
Curse of Ratilla
star
8.18
337 votes

#6 - Curse of Ratilla

Season 1 - Episode 20 - Aired 5/5/2012

Arriving at Mount Plun-Darr, the ThunderCats and Pumyra discover that the Thunderian slaves are being forced to excavate the Sword of Plun-Darr for Ratar-O and his Rats.

Directors: Tomoya Takahashi
Writer: Todd Casey
Watch Now:AmazoniTunes
Native Son
star
8.16
424 votes

#7 - Native Son

Season 1 - Episode 17 - Aired 4/14/2012

While traveling through snowy mountains in search of safe passage, Tygra and Lion-O come upon a lost tiger village and in it they find Tygra's real father. Tygra learns why his father sent him away as a baby — to save his life. But all is not as it seems in this village as the brothers learn these tigers are cursed and Tygra may be the answer to saving them — but at the cost of his own life.

Watch Now:AmazoniTunes
Journey to the Tower of Omens
star
8.15
772 votes

#8 - Journey to the Tower of Omens

Season 1 - Episode 6 - Aired 8/26/2011

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.

Writer: Tab Murphy
Watch Now:AmazoniTunes
Between Brothers
star
8.14
454 votes

#9 - Between Brothers

Season 1 - Episode 13 - Aired 11/25/2011

While Lion-O and Tygra are in the Astral Plane dealing with their issues which have been magnified by the powers of Mumm-Ra who wants them to destroy each other, the other Thundercats protect the village from Slithe, Grune and the Lizard army. The Elephants make a surprising decision after meditating and Lion-O realizes the truth of being betrayed by Tygra. Panthro has some interesting flashbacks while telling Wily Kit and Wily Kat how Grune lost his tooth, and in the end Panthro makes a sacrifice to defeat his enemy.

Directors: Shingo Uchida
Watch Now:AmazoniTunes
The Duelist and the Drifter
star
8.14
590 votes

#10 - The Duelist and the Drifter

Season 1 - Episode 8 - Aired 9/9/2011

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.

Writer: Todd Casey
Watch Now:AmazoniTunes
Song of the Petalars
star
8.05
862 votes

#11 - Song of the Petalars

Season 1 - Episode 4 - Aired 8/12/2011

While traveling through the woods, the ThunderCats come across a group of Petalars - small plant-like creatures whose lifespans are only one day. Lion-O befriends the young Emrick as he and the others try to figure out a way out of the woods and return the Petalars to their home. Meanwhile, Slithe and his lizard army are hot on the ThunderCats' trail to eliminate them.

Writer: Tab Murphy
Watch Now:AmazoniTunes
The Forest of Magi Oar
star
7.94
649 votes

#12 - The Forest of Magi Oar

Season 1 - Episode 11 - Aired 11/11/2011

When in the Forest of Magi Oar, the ThunderCats send WilyKit, WilyKat and Snarf to search for firewood. After they return, they start a fire and lay down to rest. Lion-O then throws a special piece of firewood that releases several seemingly evil spirits around them. After Lion-O and the rest of the ThunderCats cannot defeat them, the ThunderCats meet the Wood Forgers who have a talent for using paper magic in combat.

Watch Now:AmazoniTunes
The Soul Sever
star
7.93
246 votes

#13 - The Soul Sever

Season 1 - Episode 24 - Aired 6/2/2012

After making it back to the City of Dogs, Panthro is wondering why the Book of Omens is pointing to the sky. Lion-O runs into Jorma who had survived the attack on Thundera and has made it home. Upon studying the book, Jorma concludes that one of the stones the ThunderCats are after is somewhere in the sky. While exploring a secret scrap pile where new scrap metal falls from the sky, Lion-O, Tygra, Panthro, and Jorma are attacked by Necromech robots which end up stealing the Book of Omens. Upon tracking the Necromech robots, Lion-O, Tygra, and Panthro discover that they work for the Soul Sever (an alien turned robot by the Necromechs) who plans to use the power of the Book of Omens in order to find vessels for the three spirits of his deceased family.

Watch Now:AmazoniTunes
Ramlak Rising
star
7.92
822 votes

#14 - Ramlak Rising

Season 1 - Episode 3 - Aired 8/5/2011

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.

Writer: Todd Casey
Watch Now:AmazoniTunes
Trials of Lion-O (2)
star
7.92
423 votes

#15 - Trials of Lion-O (2)

Season 1 - Episode 16 - Aired 4/7/2012

Lion-O must finish his trials in order to rescue the other ThunderCats from Mumm-Ra and his army.

Watch Now:AmazoniTunes
Trials of Lion-O (1)
star
7.87
454 votes

#16 - Trials of Lion-O (1)

Season 1 - Episode 15 - Aired 3/31/2012

The ThunderCats are ambushed by Slithe who is now assisted by Kaynar and Addicus. When Lion-O is knocked into the river and pinned down by the rocks, he finds himself in the spirit world where Jaga tells him that he must pass a bunch of tests in order to return to the living. The first test taking place in the simulation of Thundera's slums has Lion-O trying to figure out which Wilykit and Wilykat has the key to pass to the next test. The second test has Lion-O having to race Cheetara through a labyrinth. Back in the living, Tygra and the other ThunderCats managed to get free from their shackles, but Slithe, Kaynar, and Addicus escape with the Sword of Omens. Tygra vows to get the Sword of Omens back.

Watch Now:AmazoniTunes
Into the Astral Plane
star
7.85
533 votes

#17 - Into the Astral Plane

Season 1 - Episode 12 - Aired 11/18/2011

Tygra's jealousy boils over, leading to a clash with Lion-O.

Watch Now:AmazoniTunes
Old Friends
star
7.84
853 votes

#18 - Old Friends

Season 1 - Episode 5 - Aired 8/19/2011

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.

Writer: Tab Murphy
Watch Now:AmazoniTunes
Sight Beyond Sight
star
7.76
681 votes

#19 - Sight Beyond Sight

Season 1 - Episode 10 - Aired 11/4/2011

The Cats track the location of the first stone to the mystical Elephant Village, but Lion-O can't find the specific location and the forgetful Elephants no longer remember where it is.

Writer: Tab Murphy
Watch Now:AmazoniTunes
Recipe for Disaster
star
7.76
360 votes

#20 - Recipe for Disaster

Season 1 - Episode 23 - Aired 5/26/2012

The Thundercats require the assistance of a snake oil salesman named Ponzie to defeat Mumm-ra’s latest monstrous form.

Watch Now:AmazoniTunes
What Lies Above (1)
star
7.70
373 votes

#21 - What Lies Above (1)

Season 1 - Episode 25 - Aired 6/9/2012

The book of Omens leads the Thundercats to a city in the sky ruled by birds!

Watch Now:AmazoniTunes
The Pit
star
7.58
358 votes

#22 - The Pit

Season 1 - Episode 19 - Aired 4/28/2012

A refugee cat is forced to fight in gladiator-style battles in a city of dogs.

Watch Now:AmazoniTunes
Berbils
star
7.55
654 votes

#23 - Berbils

Season 1 - Episode 9 - Aired 10/28/2011

The ThunderCats meet the mysterious beings who had helped them during the night and they turn out to be the Berbils, or Ro-Bears. The Berbils treat the ThunderCats with great hospitality until the village is attacked and some of the Berbils are captured. The ThunderCats help their new friends and a battle for freedom ensues.

Watch Now:AmazoniTunes
New Alliances
star
7.48
451 votes

#24 - New Alliances

Season 1 - Episode 14 - Aired 3/24/2012

The Thundercats go on the offensive taking down Mumm-Ra’s lizard army piece by piece. Lion-O appeals to the soldiers to turn against their overlord, but Mumm-Ra won’t see his army crushed so easily. He tasks Slithe with recruiting two new and vicious Generals — Addicus and Kaynar — to retaliate against the cats. Meanwhile, the Robear Berbils make Panthro a new set of robotic arms and soop up the Thundertank.

Watch Now:AmazoniTunes
The Forever Bag
star
7.28
299 votes

#25 - The Forever Bag

Season 1 - Episode 22 - Aired 5/19/2012

WilyKit, WilyKat, and Snarf track down a thief in Dog City.

Watch Now:AmazoniTunes

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