Wherever he goes and whatever he's up against, he 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!