Following the events of the previous night, Lion-O, Cheetara, and Tygra hold a funeral pyre for King Claudus, with Lion-O etching the Thundercats symbol into the broken statue of his father. Determined to get revenge on Mumm-Ra, Lion-O sets out for the Sea of Sands with a reluctant Cheetara and Tygra in tow. As they leave Thundera, WilyKit and WilyKat approach the trio, asking to join in the journey until they find El Dara. Lion-O refuses, but the twins follow anyway. They reach a desert-like ocean, but are captured by a boat crewed by a group of fishmen. Their captain, Koinelius Tunar, is obsessed with tracking down and killing a creature called Ramlak, which sucked up the waters of the fishmen's homeland. Lion-O begins to succumb to his own obsession, helping Tunar track down the creature despite the protests of Tygra and Cheetara alike. Eventually the Ramlak snags the ship with it's tentacles and tears it to pieces, forcing Lion-O to forget his obsession and save everyone from drowning, while Tunar dies as he makes one final strike at Ramlak. Once everyone is safe, Lion-O is seemingly devoured by Ramlak, only to cut his way out with the Sword of Omens, releasing the stolen waters from its' body. With their home restored, the fishmen bid the group farewell, and Lion-O accepts the twins into the group after seeing their capability in battle. At Mumm-Ra's pyramid, it is revealed that Jaga is still alive, but now a prisoner inside a dark magic lantern, which Mumm-Ra claims will lead him to the Book of Omens.