Synopsis
In the episode's opening, Super Sonic is fighting against a mysterious robot. Super Sonic is unable to defeat him and he sends the Chaos Emeralds away to avoid his opponent to take them from him. Without the Emeralds, Sonic loses his energy and he falls to his planet. Another robot (a Metarex) follows him. Back on the planet, Tails, Amy, Cream & Cheese watch the sky and assist to a meteoric shower. However, a space ship crashes near them, carrying a strange alien girl named Cosmo. After introducing themselves, they are surprised by the arriving Metarex who starts destroying the forest with laser beams. Tails, accompanied by Cosmo, starts fighting it with the X-Tornado and he's soon joined by Knuckles. Sonic (who was rescued by Dr. Eggman) arrives but they can't beat the Metarex. The last Metarex was able to finish his duty: which was to remove the "planet egg". Cosmo explains that the planet egg "is the lifeforce that sustains their world". Sonic, Tails, and Knuckles make a last effort to save the Planet Egg, but the Meterex escapes. Cosmo then tells Sonic that he is the final hope to save the galaxy. At the same moment, Chris (who is now 18) completes his new machine that will transport him to Sonic's world. It works, but Chris arrives in his 12-year-old body.
