Prototype Freddy is one of the antagonists in Sinister Turmoil.
Prototype Freddy bears a strong resemblance to Toy Freddy.
This is due to Prototype Freddy being built from a recovered Toy Freddy shell from the Fazbear's Fright incident, as well as a modified endoskeleton.
Due to this, or despite this, Prototype Freddy includes certain modifications from his original form. These including fluorescent yellow eyes, sharp tipped fingers, and sharp teeth.
- Prototype Freddy, much like his fellow Prototype Animatronics, were initially wrongly tagged as the "Nightmare Toys", or "Sinister Toys" before the adjective was officially announced.
- He appears on the cover of "Sinister Aspiration".