"Ian pulled me aside one day and he goes, 'If you kill Enzo, I'm going to quit,'" recalled executive producer Caroline Dries.
"We purposefully had him show up at the end as a ghost to imply that his story isn't over. He is going to become a ghost villain moving forward. We'll see him all the way through to the finale as the bad guy."
But how much damage can Enzo actually do as a ghost?
Quite a lot, it seems, due in part to the continued disintegration of the Other Side.
"You just wait and see," Dries said of Enzo's plan.
"You can do a lot from the Other Side it turns out. He's determined to make Damon's life and Stefan's life a living hell. We realize why and how he's able to do that, and it's because of what's happening on the Other Side that is giving him more liberties than some of the other ghosts have had."
Enzo crossing over also serves a dual purpose, Dries said: "His story isn't just about him being the villain; it's also about us seeing a new set of eyes in this Other Side world.
Stefan and Elena's decision to keep Enzo's death a secret from Damon plays into the next episode pretty significantly.
Hailed as the "Cabin in the Woods" hour, Damon picks up on the fact that the two are hiding something big, prompting them to play a game of truth.
"He's definitely not very happy," said Ian Somerhalder of Damon's mindset, hypothesizing that Enzo "would have done the same thing" had he been in Damon's shoes in 1960.