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We finally learned the back story for The Vampire Diaries' huge new villain, sexy siren Sybil (Nathalie Kelley)—and it turns out that not only is she not working alone, she's actually the LESSER of two evils. The real mastermind? Her sister, Seline (Kristen Gutoskie)—a.k.a. the sweet babysitter who's been taking care of Alaric (Matt Davis) and Caroline's (Candice King) twins.

But unfortunately, Stefan (Paul Wesley) has had his memory of the revelation wiped out—so the audience knows what incredible danger everyone's in, but no one else does. Gutoskie tells E! News that Seline will use that ignorance to her advantage in an attempt to get closer to the supernaturally gifted children.

The Vampire Diaries

The CW

"In the next episode I think her focus is on the twins and I think their power is something that is very interesting to her," she says. "I think she can see some of herself and her sister in the twins being powerful, young sisters who are kind of outcasts essentially. I think that you'll definitely see her finding more of an interest in them. Then just a little bit of love/hate with her sister, you'll definitely see some of that."

We saw that love/hate relationship in the telling of their origin story, which leads us to wonder if Sybil could potentially be convinced to betray her sister and join the side of our Mystic Falls heroes. There's a chance, Gutoskie says.

The Vampire Diaries

The CW

"I think with every sibling rivalry there's potential for both. I think it is definitely possible that Sybil could turn the table on Seline," she says. "You have a loyalty to each other having been bound for thousands of years together, but they definitely have a lot resentment and being paired together doing evil acts for that many years is probably going to create some sort of build up. They are very influenced by their evil acts. If you're serving the devil for that many years, as good as you can be underneath I think you get really used to the betrayal and dishonesty. I think there's potential for Sybil definitely to turn the tables—or maybe at the end of the day her sister is more important. I think both potential things could happen!"

This is TVD, so clearly the group will find out Seline's true identity eventually—and that'll be terrifying for them. "I definitely think Caroline and Alaric have a lot to fear when they find that out," Gutoskie says. "Sybil being so powerful, and because her powers trump vampire power, I think everyone has a lot to fear. Once they find out I think it kind of throws things into a bit of chaos, and it definitely throws everybody off and they have to go at another way to figure out how to stop these [sirens]."

The Vampire Diaries

The CW

Things will also be kind of awkward considering it's clear there's a spark between Seline and Alaric—and something very well may happen there sometime soon. "I mean, he's a handsome dude and a good guy, why wouldn't she be into it," jokes Gutoskie. "I think Alaric and her have chemistry and I think there's definitely something appealing to her about him, because being an outcast and cast away to this island away from her family—to see this man take care of his family and be a really good outstanding human, I think there's something about that that really draws Seline, her more compassionate and human side, to him."

But Alaric probably won't be into it once he finds out that she's an evil siren who's after his daughters. "You never know! We'll see," Gutoskie teases. "If he's into it when he finds out who she really is, will he accept all of Seline? I don't know."

The Vampire Diaries airs Fridays at 8 p.m. on The CW.