Season 1 part 2
Episode 6: Journey to the Tower of Omens (August 26, 2011)
While Lion-O practices with the Sword of Omens, Mumm-Ra forces Jaga to reveal the location of the Tower of Omens; which has the Book of Omens hidden within. In the Jungle, Snarf, while trying to fill his appetite causes a ruckus which reveals the entrance to a temple leading to the Tower. After entering the temple, each member of the Cats solves one of a series of deadly puzzles and reach the Tower's entrance. Lion-O uses the Eye of Thundera and finds a button that opens the way to the Tower of Omens, which Tygra opens with his whip. Mumm-Ra then reaches the Tower, having located it thanks to Jaga. A fierce battle takes place in the tower, during which Mumm-Ra transforms into his muscular winged form, where, just as Mumm-Ra was about to finish Lion-O off, Jaga sacrifices himself to save Lion-O and the others. Soon afterwards, the Cats claim the Book of Omens, where Lion-O discovers it is actually blank.
Episode 7: Legacy (September 2, 2011)
After recovering the Book of Omens, Lion-O is able to power it up and his soul is sent into the book. Lion-O meets Jaga's spirit, who explains that the book is a fusion of magic and technology, and that the book's laws of life, death, and reality are different, sending Lion-O into the book's data to see how history unfolded through the eyes of his ancestor Leo. In the past, Lion-O discovers that Leo is the commander of the cats, who serve Mumm-Ra as his jailers of the other Animals. Mumm-Ra is after the Warstone, which Lion-O recognizes as the Eye of Thundera. After discovering its location, Mumm-Ra sends forces to the planet below to recover the stone. At the same time, a riot breaks out in the prison bay. Leo and his second-in-command and girlfriend, Panthera arrest the Jackal and Lizard perpetrators where Lion-O discovers that they are planning a rebellion with the Animals. Leo uses his mages to construct the Sword of Omens and the Gauntlet. Captain Tygus recovers the Warstone, but it is taken by Leo who then proceeds to use it to complete the Sword of Omens. Leo then confronts Mumm-Ra, and learns about three other similar stones, taking one. Mumm-Ra uses the two remaining stones to create a battle armor powered by magic. Leo is able to force Mumm-Ra off the platform, giving him time to free the Animals, inspiring them to fight. Mumm-Ra returns to finish the battle, and seems to be winning, until Leo adds the stone he took to his gauntlet. After the battle, Leo overpowers Mumm-Ra and takes the other two stones, causing Mumm-Ra to become decrepit and old. The ship, damaged by their fight, is hit by a space storm and begins to crash. Mumm-Ra manages to put himself into an emergency capsule, but Leo and Panthera destroy the controls, trapping him inside. Lion-O is pulled out of the simulation, and Jaga reveals that the data had been corrupted by the crash, but there were enough survivors to start civilization. However, the other three stones were lost all over Third-Earth. He realizes that he must find the three stones using the Book of Omens, and unite the Animals once again. Lion-O returns to his body, waking up with the others standing over him concerned. Newly confident, he states that he now knows what they must do.
Episode 8: The Duelist and the Drifter (September 9, 2011)
Panthro and Tygra try to rig the Book of Omens to the Thundertank, their latest attempt damaging the entire tank. When in a nearby town getting supplies, Lion-O has an encounter with a Drifter who warns him to stay away from the town. Lion-O learns that the town doesn't accept Thunderian currency after what happened to Thundera. Lion-O enters a sword competition to get local currency and wins by slicing the stone block in half with the Sword of Omens. He soon gets challenged by the Duelist (a professional swordsman who collects the swords of the opponents he has defeated) to a sword match with the Sword of Omens as its wager. The Drifter reveals that the Sword of Hittanzo is the Duelist's best sword (which he claimed from its sword-maker) and learns that the Drifter was the sword's maker and he warns Lion-O that no one can beat his creation. When it comes to the match, the Duelist manages to overcome Lion-O and claim the Sword of Omens. Afterwards, Lion-O ends up gaining the unlikely assistance of the Drifter to make another sword. Once the sword is forged, Lion-O seeks out the Duelist at a nearby tavern and challenges him to a rematch for all of Duelist's swords with Duelist wanting Lion-O to put up his life as well. During the rematch, Lion-O does his best to evade the Duelist's attacks until the Duelist breaks Lion-O's sword. Upon following the Drifter's "willows are weak" philosophy, Lion-O uses this wisdom to disarm Duelist of his swords. Drifter says that he has what he needed to win in himself. When Duelist tries to attack Lion-O, the Drifter manages to successfully knock down the Duelist and send him out of town. Before going their separate ways, Drifter tells Lion-O that he will return the swords to their rightful owners. Lion-O reunites with Tygra and Panthro who wondered what took him so long.
Episode 9: Berbils (October 28, 2011)
Tiny robot bears called Berbils solicit the help of the Thundercats to save them from a slave trader named Conquedor who values their technical and construction skills. The Cats also decide to help rescue the enslaved Berbils and defend their village. Meanwhile, Panthro learns that he's not the only "wrench monkey" in the group when he bonds with Ro-Bear-Bill. Especially when they come up with a way to drive away the Conquedor, the Trollogs, and the Giantors. Later, WilyKit and WilyKat discover Candy Fruit, which appears to give them a sugar rush, helping them in the fight.
Episode 10: Sight Beyond Sight (November 4, 2011)
While driving through the desert, Panthro tells Lion-O that the Book of Omens has detected one of the three magical stones. During a race between the Thunder Tank, Lion-O, Tygra, and Cheetara, Wilykit and Wilykat accidentally sets off the missiles which they evade. Upon arriving outside a giant temple, the Thundercats end up meeting a group of Elephants led by Aburn and Anet where they ask where the magical stone is. Under the suggestion of Anet, Lion-O ends up using the Sword of Omens' power and is told that he must be in harmony with it. During the training, the Elephants' village is attacked by the insect-like Wraiths who are after their harvest. Following the Wraiths attack, Anet states that they have some food left to harvest. Ahnet tells Lion-O to be in harmony with the Sword of Omens and vows to get the stolen harvest back. When Wilykit is playing her flute, Aburn and Wilykat end up joining in on her performance which attracts the attention of the other Elephants who join in as well. Meanwhile, Lion-O climbs up a cliff leading to the Wraith's lair and loses his grip when they attack. Luckily, Lion-O uses his Claw to grip onto the side of the cliff as the Wraiths swarm all over him. He dives into a hole in a cliff and ends up discovering that the hole is actually their hive. Upon getting out, he uses the Sword of Omens to seal the cave in order to keep them out. Just then, a Stone Giant awakens and finds some dead Wraiths. Later that night, Lion-O returns and learns from Anet that the "universe is out of tune" and that their sounds is what kept the Stone Giant away. While the Elephants meditate, the Thundercats do battle with the Stone Giant where they discover with every attack, the Stone Giant reassembles. Upon trapping the Cats, the Stone Giant attacks the Elephants' village and starts eating the stone structures. Wilykit and the Elephants end up playing music loud enough for the Stone Giant to crumble. As the Elephants rebuild their village, Anet puts Lion-O through his harmony training again and is able to use the Sword of Omens' power to find one of the magical stones in a nearby hut. When the magical stone isn't seen there, Anet tells the Thundercats to go to the Forest of Magi Oar in order to amplify the Sword of Omens' power.