The 100th episode of The Vampire Diaries was a game-changer in so many ways, which means we’re looking forward to the next installment of TVD with even greater anticipation. What can we expect from Season 5, Episode 12 (“The Devil Inside”)? Executive producer Julie Plec talked to E! Online about the subsequent chapter in the TVD tale.

“I love the next episode so much because it's this great fallout of everything that happened in the 100th and it's so much fun,” Julie teased. “It's so painful and wonderful. I'm excited about the next few actually.”

One major game-changer we’re eager to see play out is Katherine’s possession of Elena, of course. It sounds like the not-dead Traveler will be having a lot of fun as her better-loved doppelganger — specifically when it comes to the Salvatore brothers: “[Katherine]'s so into Stefan right now and so not into Damon right now, and yet Elena was about ready to re-embrace her relationship with Damon and Damon was all ready to win back his girl, so you can only imagine how that's going to go down,” said Julie. “Katherine does some of the bitchiest stuff as Elena in the next part of the chapter. It's great.  It's Katherine at her most diabolical.”

The other major development set to have serious fallout: Klaroline’s steamy wilderness hookup. You can bet Caroline will be freaking out about the scandalous behavior in which she indulged, even if Klaus isn’t around as a rather delicious reminder. Julie said “the timing couldn’t be worse” given that Tyler just strolled back into her life.

“And you know when you're a good girl and you do a naughty thing and then you feel like everything in the universe is conspiring to remind you of just how naughty you were?” asked Julie. “I think she's going to have a lot of those moments as a character and beat herself up about it and be really hard on herself. Certainly, I can't imagine Tyler will take this well.” Sounds potentially explosive. Bring on the fallout, TVD!

Which storyline are you most eager to see the fallout for? Sound off in the comments below!

Catch the next episode of The Vampire Diaries on Thursday, January 30 at 8 p.m. ET on the CW.

Kayti Burt is a contributing writer for Wetpaint Entertainment with a penchant for all things pop culture. Follow her on Twitter and Google+!