Snarf helps a baby Unicorn escape from being caught by a gang of pirate raiders known as the Berserkers who are led by the ruthlessHammerhand. But Snarf himself ends up being captured by them and being forced to work as a "Beast of Burden" after Hammerhand deems him too "unnatural" to eat.Meanwhile, Lion-O encounters the mother Unicorn being attacked by a Tree Monster. Lion-O succeeds in rescuing the unicorn, but in the process loses the Sword of Omens to a Giant Crow who swipes it from his hands. To repay him for his help, the unicorn mother gives Lion-O a special ring which teleports Lion-O onto the crow's back and he is able to retrieve the sword. Upon landng back on the ground, the sword warns Lion-O that a fellow ThunderCat is in danger. He uses the sword's "Sight Beyond Sight" vision and sees Snarf's plight. He immediately rushes off to rescue his friend.As he is making his way towards the beach, Lion-O comes across the Unicorn Keepers and their herd of unicorns. Initially the husband and wife are wary of Lion-O, but he assures them that he means them no harm and uses the sword's "Sight Beyond Sight" to show them that he rescued one of their unicorns from being devoured by the Tree Monster. At that moment, the Berserkers arrive with Snarf as their captive and attack Lion-O. A fierce battle ensues between the Lord of the ThunderCats and Hammerhand but it is cut short when one of the Berserkers threatens to harm Snarf if Lion-O continues the duel. The Berserkers then make off with Snarf and the baby Unicorn in tow.Lion-O pursues the Berserkers to their ship and while he is battling the pirate raiders, Snarf and the baby Unicorn fall overboard. Lion-O dives in to the ocean after them and summons the other ThunderCats. Panthro and Cheetara come to his aid in the ThunderTank thanks to the tank's new "aquatic mode". Hammerhand fires laser beams from his ship at the Cats but Cheetara retaliates by firing lasers from the tank. Panthro then starts to rapidly circle the Berserkers' ship, creating a strong whirlpool which caused it to sink along with its dastardly crew. Lion-O and Snarf return the baby Unicorn back to its mother before heading back home.