As of now, Prototype Foxy, along with Prototype BB, are the only Sinister Turmoil animatronics to actually appear in a game in this case, Sinister Turnmoil: Sewers.

However, it appears more rounded, and has two glowing red eyes in contrast to the one normal eye on the original Mangle

Like Mangle from FNAF 2, she has a second endoskeleton head.

Prototype Foxy is, obviously, based off of Mangle from FNaF 2.

However, in the current version of the game this is broken, as Mangle will never chew the wires. To prevent this, you must use an electrical wrench to fix the wires. She will also eat some of the wires which are along the walls of the sewer, preventing you from passing them, as touching the exposed wire will kill you. However, you only have three of these on hand so the player In addition, the player must remain completely silent when walking in the sewers, as even a single noise will attract Prototype Foxy toward your location. To fend her off, you can make a sound by throwing an item into some water, or deploy the Hamster to divert her attention. When next to you, if you look away the cupcake creates a loud buzzing noise, in addition to trapping you, which will alert Prototype Foxy to your location. Hiding from her is not possible, as a small cupcake follows you constantly (though it freezes when you you look at it). The game also says Mangle will sometimes perform surprise attacks from the vents, however this doesn't appear to work or rarely happens. She is attracted to sound and light, and will run after the player when she spots them, and as she is as quick as the player itself, it is futile trying to outrun it. In Sinister Turmoil: Sewers, Prototype Foxy wanders the sewers, with her path being determined by the red light emanating from her eyes.

Additionally, this head is much rounder than the one from Prototype Foxy's FNAF 2 counterpart She also sports a companion head that has two glowing red eyes, in contrast to the one normal eye seen on the original Mangle. Unlike Mangle, who has yellow eyes, Prototype 'Foxy' has red eyes with white pupils. However, her head looks quite similar to her FNAF 2 counterpart, except it does not have any eyebrows, is filthier, and the snout is thinner, with a wire running down from her ear to under the right side of her jaw. They have pointed teeth, just like Mangle does, except these are much sharper than the child-friendly counterpart. She is a mess of endoskeleton pieces and sports multiple sharp hooks that are attached to her limbs.

Prototype Foxy, overall, heavily resembles Mangle from FNaF 2.

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