Plot Summary:

After fixing Mangle, Shadow Bonnie pleads with the Fazbear Gang to let him and Shadow Freddy leave. However, Golden Freddy and the others are too busy enjoying making Shadow Freddy suffer for all the times he caused pain and suffering to them. However, an unexpected noise is heard and Shadow Freddy and Shadow Bonnie escape from the Fazbear Gang. While attempting to thwart their escape plans, Mangle is thrown into the main stage area and a new threat emerges. The sudden appearance of Shadow Foxy, the long lost member of the Shadow Syndicate and the enforcer of the organization. 

After some long history and talks, Shadow Foxy gets ready to attack the Fazbear Gang. Bonnie, Chica, Foxy and Mangle escape while Freddy and Golden Freddy fight Shadow Foxy. After defeating Shadow Foxy, Mangle is once again active and Foxy and the rest of the gang are happy she is alive. During the conclusion, Golden Freddy reminds the viewer that the Shadow Syndicate has now got more power and they know where the Fazbear Gang are. But that they will be ready for them.

Trivia:

This is the first episode to feature Shadow Foxy.

Mangle finally returns after 27 years of being deceased.

Shadow Foxy is voiced by Scroll of the Dragon and is an original character, as Shadow Foxy is not often seen in any other FNAF media or lore.

The song playing during Shadow Foxy first appearance is "Te Gusta O No!!" by Dale Oliver and Serg Salinas. This was a theme song used by former TNA wrestler, Hernandez.