Elena and Rebekah search for Katherine and find themselves in a Pennsylvania town, where Elena has a surprising encounter with an old acquaintance.
Realizing that Elena needs some time away from Mystic Falls, Damon takes her to New York City, where he lived and partied hard in the 1970s.
Elena's new outlook has everyone concerned, leading Stefan and Damon to agree that going back to a school routine is the best thing for her.
When Stefan returns to Mystic Falls with Elena and Jeremy, Caroline is worried about Elena's state of mind. Stefan reaches out to Dr. Fell for help.
On the island, Damon has an ugly run-in with a hunter. Stefan confesses his true feelings about the possibility of becoming human again to Elena.
Shane leads an expedition to a desolate island off the coast of Nova Scotia, where he believes the secret of the cure lies hidden.
After confronting her father, Mayor Hopkins, over his unconventional approach to ending the violence in Mystic Falls, Bonnie has a run-in with Kol.
Jeremy is furious when Klaus tries to control him by putting Matt's life in danger. Damon coaches Jeremy as he prepares to take on Klaus's new vamps.
Appearing unexpectedly at Mystic Falls High, Rebekah tries to force Stefan, Elena and Caroline to answer her questions about the search for a cure.
As a winter-themed party fills the streets of Mystic Falls, Stefan and Caroline are at odds with Tyler over his plans for Klaus and his hybrids.
Investigating a suspicion about Elena, Damon and Stefan visit New Orleans to see if they can find anyone who remembers their last visit in 1942.
Caroline does her best to be there for Stefan and Elena during a tough time. Damon tries to convince Stefan to help him uncover Prof. Shane's motives.
Terrifying hallucinations leave Elena shaken and confused. After giving Stefan disturbing news about Elena, Klaus takes matters into his own hands.
Stefan and Klaus form an uneasy alliance to try and contain the danger that Connor has unleashed. Connor takes Jeremy, Matt and April hostage.
Damon, Elena and Bonnie visit Whitmore College, where Prof. Shane is taking over the occult studies classes formerly taught by Bonnie's grandmother.
Connor continues his search to uncover the secrets of Mystic Falls. Damon and Klaus question Connor, but the confrontation takes a lethal turn.