Sonic the Hedgehog is a video game franchise created by Sega. The franchise primarily revolves around Sonic, a blue anthropomorphic hedgehog with supersonic speed, who often goes on adventures to thwart the plans of the villainous Dr. Robotnik, also known as Dr. Eggman, who seeks to conquer the world.
Tails is a fox with two tails, hence the nickname "Tails," and is known for his ability to fly by spinning his tails like helicopter blades. He is Sonic's best friend and sidekick, often accompanying him on adventures to defeat the villainous Dr. Robotnik (also known as Dr. Eggman) and save the world.