Damon tries to find the right way to make a disturbing confession to Elena. Caroline discovers a scary secret in Dr. Wes' files. Enzo claims to have a solution everyone is searching for. Sloan reveals new information on the importance of doppelgangers.

Bonnie has an unsettling encounter with Luke, and learns more about his family history. The Travelers' leader, Markos, arrives in Mystic Falls.

Stefan and Elena experience unsettling dreams of the life they might have had together. Bonnie has a disturbing encounter with Grams. Enzo searches for a woman he loved decades ago. Bonnie learns that Jeremy is working with Liv. Matt has a terrifying encounter with inhabitants of the Other Side.

Enzo holds Elena, Stefan and Bonnie hostage to uncover the truth about the love of his life. Markos performs a ritual to undo witch's magic.

Damon and Caroline suspect Stefan and Elena of keeping a secret while they hide from the travelers, unaware of the dead man out for revenge. Meanwhile Matt, Jeremy and Bonnie help Tyler get rid of Julian.

Stefan and Elena become stranded in a remote location, after escaping from Markos, and he gets philosophical about her relationship with Damon. Damon sets a trap for Markos. Bonnie admits that she's been keeping the truth about the Other Side from everyone. Caroline witnesses an unthinkable act of violence by one of the Travelers.

Damon's plan causes a huge explosion in Mystic Falls, and everyone is caught up in the confusion, leaving a trail of heroism, sacrifice, relief and despair.

After spending the past four months coping with the loss of Damon in an unconventional and potentially dangerous way, Elena has returned to Whitmore College for the start of sophomore year. Unable to move on, Caroline is desperate to find a way to reverse the anti-magic spell the Travelers have put over Mystic Falls and grows frustrated when her calls to Stefan go unanswered. Tyler, who is human once again, has a run-in at a football tailgate that tests his ability to control his anger, while Matt worries that Jeremy is dealing with the loss of Bonnie in a self-destructive way. Alaric, who is struggling to adjust to his new life as a vampire, finds himself in an awkward situation when he meets Jo, a beautiful doctor at the university hospital. Last, while everyone believes Stefan is off tracking a lead to get Damon and Bonnie back, Elena is shocked when she learns the truth of what he has really been up to.

In an attempt to bring some fun back into their lives, Elena persuades Caroline to meet her at the swimming hole where she plans to introduce her to Liam. Tyler, still working on controlling his anger issues, asks Liv for a favor and is surprised when she makes an unexpected confession. Stefan arrives back in Mystic Falls looking for Enzo and is caught off guard when he notices a strange change in Elena. Meanwhile, at the lake, Enzo’s actions cause Matt to make a startling revelation, and Jeremy makes a discovery about the anti-magic spell that could potentially put Elena’s life in danger. Elsewhere, Damon and Bonnie stumble upon clues that lead them to believe they’re not alone.

When the past comes back to haunt her, Elena is forced to face her problems head on. After a night out at the annual Whitmore Medical Center Fundraiser, Jo opens up to Alaric about her own tragic past. Meanwhile, Stefan, Matt and Enzo resort to extreme measures when Tripp withholds information about his vampire-killing operation, and Caroline is in a race against the clock when Sheriff Forbes gets caught in the middle of a dangerous plan. Elsewhere, Tyler and Liv grow closer, and Damon stumbles upon a startling clue that renews his hope.

As Caroline and Elena prepare to host Friendsgiving at the dorm, they receive some hopeful news from Alaric and Stefan, who have traveled to Portland to gather some information regarding the Gemini Coven. Tyler is determined to help Liv after she and Luke reveal some disturbing information about their witch lineage and the impending plans their coven has for them. Meanwhile, dinner takes a drastic turn when Jo, who has revealed some painful details about her past, finds herself fighting for her life, leaving Alaric scrambling to help from a distance. Finally, Kai makes a dangerous discovery that brings him one step closer to his release.

With the holidays approaching, Bonnie attempts to replicate her favorite traditions, while reminiscing about happier times with her friends. Not able to return home to Mystic Falls for her favorite time of the year, Caroline is surprised when Sheriff Forbes brings the holidays to her at Whitmore College. Meanwhile, after discovering that Jo has gone missing, Alaric turns to Damon and Elena for help, while Liv and Luke find themselves at odds when Tyler approaches them with a risky plan. Elsewhere, Jeremy helps Matt carry out a plan to take down Enzo but grows concerned when Matt takes things too far. Lastly, Stefan is forced to break some devastating news to Caroline.

More powerful than ever, Kai holds Elena captive while he learns to control his newly acquired magic. At the Salvatore mansion, Liv and Alaric try to prepare Jo for the impending merge ceremony with Kai, but they quickly realize Jo is weaker than they thought. After bringing Sheriff Forbes home from the hospital, Caroline travels with Stefan to North Carolina in search of a cure for her mother's cancer. Meanwhile, Stefan, who has his own intentions for traveling to North Carolina, is caught off guard when Enzo shows up demanding to know what Stefan is hiding. Lastly, when Damon discovers Elena has been kidnapped by Kai, he is forced to rethink his strategy after an unexpected visitor throws a wrench into his plan.

When Liv and Luke’s father arrives to town to celebrate their birthday, they try and convince him to let Jo and Kai take their place in the merge ceremony. After Tyler finds out that the merge is happening sooner than he expected, he urges Liv to let him talk to her father. Meanwhile, after Caroline’s plan to cure her mother takes an unexpected and devastating turn, Elena, Stefan and Damon gather at the hospital, while Jo attempts to save Sheriff Forbes’ life. Lastly, with the merge set to take place, Damon’s risky plan quickly sends things spiraling out of control, forcing one of the twins to take matters into their own hands.