"The Day Will Come When You Won't Be"
The Walking Dead
Season 7, episode 701 (2016)

The season seven premiere is in the running for the most violent TV episode EVER. Filled with a hovering dread the show had never produced before, episode 701 features the true introduction of Negan, a baseball bat-wielding psycho and leader of a new group of survivors called the Saviors. He introduces himself to Rick, Daryl and the others by murdering Abraham and Glenn. He smashes their heads in with his bat, leaving nothing but pulp behind.