The Sonic the Hedgehog Universe is a fictional world centered around the character Sonic, a blue anthropomorphic hedgehog known for his incredible speed. This universe features various characters, including his friends like Tails, a two-tailed fox, and Knuckles, a red echidna. The main antagonist is Dr. Robotnik, also known as Eggman, who seeks to conquer the world and capture the Chaos Emeralds, powerful gems that grant immense abilities. The universe is set across diverse environments, such as lush green hills, futuristic cities, and treacherous mountains. Each location presents unique challenges and enemies. The franchise includes video games, animated series, and comics, expanding the lore and adventures of Sonic and his companions as they battle against evil and protect their world.