★ ARCHIVE · 2011 SERIES · EPISODES 1-26

Cartoons.

EP Title Air date Synopsis
S01E01 Omens, Part One Jul 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.
S01E02 Omens, Part Two Jul 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...
S01E03 Ramlak Rising Aug 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...
S01E04 Song of the Petalars Aug 12, 2011 On the run from the unstoppable lizard army, Lion-O fears for his life. While hiding, he encounters a race of creatures who live out their entire lifetime in 24 hours, and learns a valuable lesson about hope. Plus, the...
S01E05 Old Friends Aug 19, 2011 Panthro finally joins the team, but his gruff demeanor intimidates Lion-O. Despite his best efforts, Panthro can't dissuade the Cats from following him on a mission to get Thundrillium to fuel the Thundertank.
S01E06 Journey to the Tower of Omens Aug 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...
S01E07 Legacy Sep 2, 2011 Lion-O ventures into the Book of Omens where he becomes the incarnation of his renowned ancestor, the valiant Leo, who led the rebellion against Mumm-Ra in a previous millennium.
S01E08 The Duelist and the Drifter Sep 9, 2011 While traveling, Lion-O's cockiness loses him the Sword of Omens to the Duelist, a villainous sword-collector. With the help of the listless Drifter, Lion-O must get it back.
S01E09 Berbils Oct 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...
S01E10 Sight Beyond Sight Nov 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.
S01E11 The Forest of Magi Oar Nov 11, 2011 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.
S01E12 Into the Astral Plane Nov 18, 2011 The Cats are ready to retrieve the stone from the "Astral Plane" in the Elephant Village, but find it overtaken by Grunea and Mumm-Ra's forces. Plus, Tygra and Cheetara's early relationship to one another is revealed.
S01E13 Between Brothers Nov 25, 2011 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.
S01E14 New Alliances Mar 24, 2012 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.
S01E15 Trials of Lion-O, Part One Mar 31, 2012 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.
S01E16 Trials of Lion-O, Part Two Apr 7, 2012 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.
S01E17 Native Son Apr 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...
S01E18 Survival of the Fittest Apr 21, 2012 While Lion-O and Tygra were off with the tiger clan adventure, the rest of the crew is keeping an eye on the Thundertank. The twins are looking for some stashed food, but it appears Snarf beat them to the goodies...
S01E19 The Pit Apr 28, 2012 The Thundercats discover a cat refugee, Pumyra, being forced to fight as a gladiator in a city of Dogs.
S01E20 Curse of Ratilla May 5, 2012 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.
S01E21 Birth of the Blades May 12, 2012 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...
S01E22 The Forever Bag May 19, 2012 Seduced by the fun-loving lifestyle of Tookit and the orphans they meet, WilyKit and WilyKat are tricked by Tookit into becoming thieves again.
S01E23 Recipe for Disaster May 26, 2012 When Mumm-Ra unleashes the deadly Sycorax, the ThunderCats turn to an unlikely savior -- a snake oil salesman named Ponzi whose potion is the only thing that repels the beast.
S01E24 The Soul Sever Jun 2, 2012 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.
S01E25 What Lies Above, Part One Jun 9, 2012 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.
S01E26 What Lies Above, Part Two Jun 16, 2012 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.