On Sonic's 16th birthday, excitement fills the air as he throws a vibrant party at his parents' house, surrounded by his closest friends: Tails, Knuckles, Amy, Blaze, Rouge, Silver, Shadow, Cream, Vector, Charmy, and Espio. Laughter, music, and the delicious smell of cake create a joyful atmosphere filled with games and shared memories.

Amid the celebrations, Silver accidentally bumps into a shelf, causing an old, dusty photo to fall. He picks it up and wipes away the grime, revealing a small dark blue hedgehog holding a one-year-old baby Sonic. Confused, Silver turns to the others, but no one recognizes the hedgehog in the picture.

“I don’t know who that is,” Sonic admits, studying the photo in puzzlement. Realizing he needs answers, he decides to ask his parents, Bernadette and Jules, as well as his Uncle Chuck.

As he approaches them in the kitchen, Sonic says, "Mom, Dad, can you sit down for a minute? I need to ask you something." Jules puts down the cake he’s slicing, sensing the urgency in Sonic’s voice. "Sure, Sonic. What’s on your mind?" he replies. Sonic then reveals the photo, and Jules, eyeing it with widening eyes, says, "Sonic, sit down and let us tell you who that is..." The room is thick with anticipation as they prepare to share a family story that could change everything.