FNaS 3 Reburned takes place in 2027 inside a story unit that predates the restaurant from the earlier games. The original robots and clone characters from FNaS 2 have spent years deteriorating in this facility: broken, filthy, and long unused. The Boo that once possessed Luiginette is now permanently fused with the character — and deeply unstable. After Clone Sonic was locked in a storage room by Eggman, the robots malfunctioned and attacked him, turning him into Salvage Sonic. Salvage escaped the room, found his clone companions dead at Eggman's hands, confronted Eggman directly, and stabbed him — but that was not the end. Eggman's spirit found Golden Sonic and took control of the body. A new attempt at the operation used a single Sonic clone as the mascot, covering his injuries with medicine that fails when he becomes hostile at night. Silver guides the night security guard, who is Modern Sonic — there to investigate what happened here. Modern must survive encounters with Salvage Sonic, the withered toy animatronics, clone hallucinations, the Boo, Shadow Sonic, and Golden Sonic across five nights. The sixth night ends with the building catching fire, a section of the roof pinning Salvage Sonic, and a final escape sequence.