Sonic the Hedgehog was created by Yuji Naka and designed by Naoto Ohshima as the new mascot for Sega to compete with Nintendo's Mario.
The original Sonic the Hedgehog video game was released for the Sega Genesis, introducing Sonic as a blue, speedy hedgehog to the gaming world.
Sonic’s design was updated for Sonic CD, introducing his longer legs and green eyes, which became the standard look for future games.
The Adventures of Sonic the Hedgehog cartoon series premiered, expanding Sonic's presence beyond video games.
Sonic Adventure launched on Sega Dreamcast, marking Sonic’s transition to 3D gameplay and a major evolution of the series.
Sonic Boom was introduced as a rebooted multimedia franchise including TV series, games, and comics, with a distinct new design for Sonic.
The first live-action/CGI Sonic the Hedgehog movie was released, reaching a broad audience and revitalizing interest in the character.
The creation of the powerful Chaos Emeralds that hold immense energy and can manipulate time and space.
Sonic is born and grows up on Christmas Island, displaying extraordinary speed from an early age.
Sonic first comes face to face with his archenemy, Dr. Eggman (Robotnik), who starts using animals for his robotic army.
Sonic teams up with Tails and Knuckles to stop Eggman's evil plans and protect the world.
Sonic defeats Eggman's plans to destroy the Great Forest and restores peace to the area.
Sonic learns to harness the Chaos Emeralds to become Super Sonic, increasing his power tremendously.
Sonic battles Eggman and his army on Angel Island to protect the Master Emerald guarded by Knuckles.
Sonic participates in stopping an ancient evil unleashed during a solar eclipse threatening the planet.
Sonic and Shadow, the Ultimate Lifeform, put aside differences to fight a common threat to the world.
Sonic confronts Dr. Eggman in a decisive battle to prevent a global catastrophe.
