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"Pretty Little Liars" will introduce a new evil in Season 6 when the Liars reunite in Rosewood after five years apart -- and "he" is seriously deadly. Not to mention, this Big Bad has close ties to someone we already know. Wait, what? Now that's a twist we didn't see coming.

Creator Marlene King recently told TVGuide.com that this season won't drag out the major reveals, and by the end of Season 6, "you will pretty much know who or who's related to this big bad." Based on what we already know about this enigmatic villain, it sounds like "he" is directly connected to whoever winds up dead in the midseason premiere. It's no secret that one Rosewood resident is going to wind up in a casket before the episode's end, but perhaps the more important question is why? And what does it have to do with the Liars?

When we caught up with the "PLL" cast at New York Comic Con in October, Lucy Hale called the new villain "smarter and edgier and deadlier" than A. "It's definitely life or death," she said. "The stakes are definitely a lot higher. It's not 'I'm going to expose your secrets.' It's 'I'm going to kill you if you don’t give me what I want.'"

Unlike A, this Big Bad sounds utterly reprehensible. So who could "he" be? Based on what we know so far, here are the top suspects: