The Walking Dead: 15 Characters You Definitely Forgot About

9. Patrick

In a time when films are being crossed over constantly, AMC clearly wanted in on the action and drafted in Harry Potter (if he were being played by a body-double of Superbad's McLovin) to take up the role of Patrick. The youngster picks up a nasty virus in Season 4, and eventually it overcomes him. Patrick transforms into a walker within the cell block at the prison and his reanimated corpse wipes out a huge chunk of Rick's group. It's a brutal time for the survivors, and proved that people are never truly safe in the new world.