The Vampire Diaries returned with its 100th episode and it proved that there will be a whole lot of drama with Katherine.

While many fans thought that the demise of Katherine was near, in Thursday night's episode fans learned that she used the Travelers' spell and jumped into Elena's body.

Katherine's evil ways will have an impact on brothers Stefan and Damon, as executive producer Julie Plec revealed to E! News.

"Oh, she's going to be at her best of no good. 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 reembrace 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," she said.

"Katherine does some of the b--chiest stuff as Elena in the next part of the chapter. It's great. It's Katherine at her most diabolical."

This is no good for Stefan, who has been trying his best to let go of Elena.

"I think a lot of what he's trying to do is move past that and move on with his life," Plec said. "So here comes Katherine, of course up to no good just as Stefan's ready to move on.

Plec also teased that Elena will be trapped inside her own body and the rules of the Traveler possession will all be explained the next episode.

"And it's pretty epic," she said. "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. It's so painful and wonderful. I'm excited about the next few actually."

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Vampire diaries