Movie
Back on the episode where they went to retrieve a projector bulb, until it was revealed later on that they already had a projector plus some film cans, I thought they were going in there to get the projector and whatever films happened to be there in the theater.
I figure that whenever the zombie apocalypse occurred, the films in the theatre would've been current films at the time, but I also kept thinking what if that theater was having a retro film festival or marathon of some older films when it all happened.
Anyway, so Ezekiel and the gang fight through all the zombies to get to the projector and film cans, only to find that the movies they have to bring back for everyone to watch at the fair are this trilogy: Night of the Living Dead, Dawn of the Dead and Day of the Dead.