Sonic is aided by his sidekick, Tails, and his friends Knuckles, Amy, and Sticks and, of course, attacked by his arch nemesis, Dr. Eggman. The series is set in a wide-open world, where most of the characters live in and around an unnamed village. Just over the horizon is a vast landscape filled with beaches, jungles, mountains, undersea civilizations, cloud cities, frozen lakes, and more!