Back to the Future movie poster with Sonic the Hedgehog replacing Marty McFly. Sonic, dressed in Marty’s signature outfit—complete with a red puffer vest, denim jacket, and sneakers—stands in the classic pose in front of the DeLorean. His gloved hand is raised to check a watch, capturing the urgency and excitement of time travel.  The DeLorean is parked behind him, with its iconic gull-wing doors open and the flux capacitor glowing. The background features streaks of fiery tire tracks, symbolizing the car's high-speed journey through time. The title "Back to the Future" is displayed prominently at the top, with Sonic's confident and adventurous expression setting the tone. The overall design should maintain the retro 80s vibe of the original poster while blending Sonic’s energetic personality into the mix.