If you're one of those people who waits until the day of the big Halloween party to start thinking about a costume, you should probably go ahead and print these out now: Courtesy of Fox's Gotham, they're paper masks of The Riddler, Catwoman, The Penguin and Fish Mooney (although they appear somewhat older than they do on the television series).

Of course, if you don't have a party to go to, or little trick-or-treaters to escort, you could always wear these while you watch the TV show, but that'd be creepy.