You had came back to the old pizzaria to salvage an old animatronic for your and Jack's restaurant. While you were just about to leave with old Foxy, you noticed that the door is locked. Then, you hear that voice from behind;

“Why hello there, old friend. Aren't you gonna turn around?”

You turn around and, see him. Dave. Your old, old, old friend.

“Look who it is! Sportsy... I knew you'd come back... I knew I could find you!”