Come the end of last night’s 100th episode of The Vampire Diaries, Damon (Ian Somerhalder) seemed in a relatively stable place. Stefan (Paul Wesley) had helped him see the error of his ways in breaking up with Elena (Nina Dobrev), and he admitted that he couldn’t live without her. So it’s time for another round of epic Delena romance and Damon’s relative stability, right? Not if Katherine, aka the current possessor of Elena’s body, has anything to say about it.

“The thing that's so great is that she'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,” executive producer Julie Plec told E! Online.

How will Damon handle the prospective rejection from the woman he loves? Er, not well. “I can't imagine that he will take it as a man and walk away with his head held high,” Julie said. “That's not the Damon we know and love. He will inevitable go a little bit mental. So we'll see how that plays out.”

Watch out, Mystic Falls — mental Damon is on the prowl! That usually means an uptick in necks snapped and scarves worn. Sounds like this might be the break that has him hanging with frenemy Enzo, reeking havoc on unsuspecting townsfolk. How will all of this affect his relationship with brother Stefan?

“They are both ultimately equal victims of Katherine's diabolical plan and unaware that they are being played, they each have stories and moments with ‘Elena’ that shift the relationship between the brothers, not necessarily in a good way,” Julie teases. “We'll have to help them find their way back to each other, if and when the dust settles from when they finally open their eyes wide enough to find out they are being played.”

Yikes! Sounds like we’re in for a rough emotional ride, courtesy of one Katherine Pierce. That girl sure does love to cause trouble!

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+!