(Bob Mahoney/The CW)

Coming up on November 15.

Professor Shane continues to ingratiate himself with Bonnie. Damon joins her to hear the prof tell them a story about ancient witchcraft. Meanwhile, Stefan and Klaus work together to help Jeremy move on from his past and look forward to the future.

The present continues to look pretty bad for Elena. She suffers from disturbing hallucinations that leads her into danger. Klaus just happens to hear about her rather unpleasant missteps on the road to becoming a full fledged vampire and he is not amused. After tipping Stefan off about what she's been doing behind his back, the original decides to deal with her in his own way.

Before Klaus can take care of Elena, she makes a horrifying confession to Stefan that rattles him. His brother also gets rattled. Matt finds some disturbing dirt on Professor Shane that leaves Damon stunned.

Discover what's in store for the Halloween episode of "Arrow" in our Primetime Dish. And take a look ahead with this Pretty Little Liars Spoiler Video: 2013 Winter Premiere.

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- Matt Purvis