He is a young anthropomorphic fox cub born on West Side Island who, due to a genetic abnormality, was born with two distinct twin-tails, hence his nickname. Due to his abnormality, Tails was a victim of bullying during his youth. One day, however, he met Sonic and was inspired to be like him after seeing him run like the wind. Tails soon after began following Sonic on his adventures and has since become his best friend and sidekick. He is able to use his twin-tails to fly by rotating them like helicopter rotors and is a mechanic genius and aerial pilot.

Just like Sonic, Tails is also accidentally teleported to Planet Earth. The two of them go in separate ways and Tails goes to New York City where he meets Venom. Since then he's set up shop to help out the city during the crisis while also trying to figure out a way to find the chaos emeralds and get back home.