Ticket Guy is a character in South Park: The Stick of Truth.
He has no role outside the story, apart from the being the clerk at Bijou Cinema. If The New Kid walks past him, he will say some lines, with most of them about him taunting the New Kid that's he too young to see Terrance and Philip: Asses of Fire 2.
Later in the game, during Nonconformist, he gets infected with the Nazi Zombie virus and becomes one of them until the game is completed. Unlike other Nazi Zombies, he cannot be fought and stays in the same place the entire game. The lines he said before to tease the New Kid about how he couldn't see the new movie will be replaced by the generic Nazi Zombie speech. You can go inside the theater but you won't be able to see the actual movie. The only sounds you will hear is stuff about Rob Schneider and farts and stuff.