Synopsis: Battle Cat is strolling through the Eternian woods, travelling to the Pool of Shadows, a place he regularly visits after a workout to take a long drink of water and a short snooze. He is unaware that he is being watched from a distance by Hordak and Mantenna. As Battle Cat approaches the pool, Hordak pours a poisonous fluid into its waters. Unknowingly, Battle Cat drinks from the pool, and quickly falls victim to the poison’s effects. He staggers back to the Royal Palace, feeling seriously ill, and is examined by one of the best doctors on Eternia. The doctor says that only a rare type of plant can heal the effects of the poison, and that plant is only found on the planet Teekay. At that moment, a Royal guard bursts in and tells the Heroic Warriors that Mantenna has delivered a note from Hordak, offering a cure for Battle Cat’s illness in return for the keys to Castle Grayskull. He-Man knows that no matter what the circumstances, they can not give the keys of Grayskull to Hordak, so he leads Moss Man and Buzz-Off to the space portals of Grayskull to travel to Teekay. The three heroes arrive on Teekay, a world populated entirely by plants. Suddenly, they are attacked by the plants, which quickly prove too strong for them, and even Moss Man’s power over plants is weakened on this world. One of the plants makes telepathic contact with He-Man, assuring him they are in no danger, and the plants carry him and his friends to a giant tree that rules over the plant world. The ruler explains that the plants of Teekay have a history of being harmed by animals, and this is why they attacked He-Man and his comrades to prevent them trying to hurt them. The ruler explains that many years ago, Teekay was ruled by a human civilization, but war broke out among the humans and resulted in the destruction of all human and animal life on Teekay. Only the plants survived, and over the centuries they evolved to become more intelligent, swearing that animals would never again rule their world. Although He-Man explains that he and his friends mean no harm and merely want to use one of the plants to cure Battle Cat’s illness, the ruler refuses to help them, explaining that to give them the plants they need would be murder and they must therefore be imprisoned. A deep pit opens in the ground beneath the three heroes, and a sticky gum sucks them in. As the heroes ponder over how to escape, a plant reaches its tentacle into their prison and tells them it has come to help them, inviting them to follow its tentacle to the surface. Back on the surface, the plant explains that it would have been impossible to take the amount of fluid the heroes require from a single plant without killing it, so instead each of the plants has made a small donation of their juice to collectively provide the necessary amount. Just then, Matmos Mount, Teekay’s largest volcano, suddenly erupts, starting a fire that looks certain to destroy all the plants. He-Man, Buzz-Off and Moss Man ascend to the volcano, and He-Man and Buzz-Off work together to pour the water from a mountain top lake onto the flames, extinguishing the fire. With the plants saved, the heroes prepare to return to Eternia, but they are stopped by the tree ruler of Teekay, who thanks them for saving the plants’ lives and showing them that not all animals are cruel or dangerous. He allows them to leave Teekay in peace, and the heroes travel through the portal back to Eternia. They return to the palace just in time to save Battle Cat with the juice from the plants, and Battle Cat gradually recovers, vowing to settle the score with Hordak when he next sees him.