The Movie Timeline - it's like a timeline, but of movies
Batman Returns - timeline
December: Oswald Cobblepot, aka: The Penguin, is born. (Gotham City, USA)
December: Max Shreck backs a recall on the mayoral election, with Oswald Cobblepot as his candidate; their plan is foiled when Batman exposes Cobblepot as the crime boss known as the Penguin. (Gotham City, USA)