During the mission to rescue Cream the Rabbit and Cheese the Chao from Dr. Eggman's headquarters, Sonic and his friends are caught in an explosion that transports them to another dimension occupied by humans. While Sonic is exploring this new place, he gets into trouble with the local police, who send the S Team, led by Sam Speed, after him. The S Team fails at catching Sonic, but Sonic falls into a swimming pool. Luckily, he is saved from drowning by a twelve year old boy named Christopher Thorndyke. Chris lives in a mansion owned by his two celebrity parents with his inventor grandfather. Chris aids Sonic in locating his friends, and it is not long before Dr. Eggman reappears. Eggman decides to make the new dimension the start of the Eggman Empire, and Sonic and Eggman battle to collect all seven Chaos Emeralds, which came to Earth with them; Sonic wants to use the Emeralds to return home, while Eggman wants to use them to take over the new world. At the end of the first season, Chaos Control occurs, but instead of sending Sonic and co. back home, parts of their world (like Angel Island) are sent to Earth instead.
