Caroline convinces Elena and Bonnie to attend Whitmore College's Bitter Ball for broken-hearted students. Bonnie meets a fellow student who appears to be dabbling in witchcraft. Tyler worries about Matt's relationship with Nadia. Damon and Enzo resort to violence to convince Bonnie and Jeremy to help them get revenge, but their plan takes a horrifying turn.

Nadia recalls her centuries-long search for her mother. Stefan, Caroline and Matt come up with a desperate plan to save Elena's life. Damon baits Tyler into an ugly confrontation and seeks revenge against Dr. Wes. Bonnie learns a terrifying secret that threatens the lives of all her friends.

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.

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.

With Homecoming around the corner, Elena invites Liam to attend a party at the corn maze with her. Instead of attending the homecoming festivities, Caroline is preoccupied after Stefan shows up unexpectedly and needs her help cleaning up a mess created by Enzo. Heeding Elena’s advice to be more social, Alaric reluctantly attends the party, but a devastating accident quickly leaves him and Jo rushing to save lives. Elsewhere, Tyler finds himself in a dangerous position when his werewolf curse is put to the test, and an emotionally embattled Stefan comes clean to Caroline about his intent to move on from Mystic Falls. Lastly, Damon and Bonnie make an important discovery that affects their quest to get back home.

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.

Damon finds himself in hot water after he carries out a plan that requires Alaric’s unwilling participation. When Elena shares some hopeful news with Jeremy about Bonnie, she is caught off guard by his reaction. Liv helps Damon and Elena with their plan to get Bonnie back, but when things take an unexpected turn, she’s left with a difficult choice to make. Elsewhere, Matt takes matters into his own hands when Enzo’s actions cross the line, and Kai’s existence continues to be a dangerous threat.

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.

Determined to celebrate Bonnie’s birthday, Elena convinces Jeremy that it’s what Bonnie would have wanted. After piecing the broken ascendant back together, Elena, Jeremy and Damon attempt to send Bonnie a message, but the situation turns dire when they make an unsettling discovery. Meanwhile, after uncovering Stefan’s secret about his great-niece Sarah Salvatore, Enzo enlists a reluctant Matt to help interfere with her life. Elsewhere, Stefan keeps a close eye on Caroline as she unconventionally attempts to cope with everything going on around her. Lastly, realizing it might be time to move on with his life, Jeremy contemplates leaving Mystic Falls for good.

It's Alaric and Jo's wedding day and Elena and Bonnie do their best to help a stressed out Jo with the last minute preparations. After uncovering some life-changing news that Damon has been keeping from him, Stefan takes his brother on a road trip to give him some perspective on his future with Elena. Elsewhere, when Caroline returns to Mystic Falls after dealing with the fallout of her humanity-free rampage, she begins making amends with her friends and comes to a realization about her and Stefan's prospects of being together. Finally, when Bonnie begins having vivid nightmares that Lily is coming after her, she enlists Matt's help in taking Lily down.

In the aftermath of Alaric and Jo’s powerful nuptials, things take a dramatic turn when an uninvited guest shows up, leaving Elena in terrible jeopardy. Despite Matt’s advice to leave town to protect herself, a defiant Bonnie takes matters into her own hands after finding herself on the receiving end of a twisted plan. As Stefan and Caroline reach an emotional crossroad in their relationship, a reunion with Liv leaves Tyler faced with a decision that could change his life forever. Meanwhile, Lily's reckless actions cause Stefan to realize the lengths to which his mother will go to reunite with her “family.” Finally, after a devastating chain of events, Damon is forced to make the most difficult decision of his life.