Stefan escorts Elena to the town's Founder's Party. At the party, Damon tells Elena a story about the Salvatore family, leaving Elena with questions Stefan refuses to answer.

Stefan is hopeful of his plan to get rid of Damon, and decides to reveal parts of his past to Elena. Bonnie seeks advice from her grandmother (Jasmine Guy - A Different World).

In flashbacks, Stefan reveals to Elena the Salvatore family history, including how his rivalry with Damon began. In the present, Damon impulsively takes control of Vicki's future.

Stefen gets a surprise visit from old friend Lexi. Caroline tries to get Damon's Medallion back from Bonnie.

When Sheriff Forbes tells Damon of another attack, he offers to track down the killer, learning startling information about the town's founding families.

Recurring guest star Melinda Clarke appears as Kelly, Matt's long-lost mother. Sheriff Forbes (Marguerite Macintrye) asks Damon to be part of a fundraising bachelor auction.

Stefan is forced to make a frightening decision. Matt is hopeful that his mom, Kelly (Melinda Clarke), will stay. And, after Caroline's car breaks down in a storm, she makes a horrific discovery that shocks everyone in town.

Stefan displays a rare party attitude and Damon's attempt to find out why Elena's uncle, John Gilbert (David Anders - Alias, 24) has returned to town an ugly turn.

Elena and Caroline compete in a beauty pageant. Spencer Locke appears as one of the contestants. John Gilbert tries to scare Damon

Damon and Alaric try to stop John Gilbert from setting a plan in motion to bring Founder's Day to an end amid chaos, destruction and death.

Elena comes home to a nightmare; Damon realizes Katherine has returned; Tyler receives a surprise visit from his uncle.

Tyler learns more about the Lockwood family curse from Mason, and Sheriff Forbes receives startling information.

Katherine chooses a new victim. Bonnie discovers new information about Mason and shares it with Stefan.

While Damon tries to get the truth out of Jules, he asks Elena to keep an eye on Rose, a situation that turns unexpectedly dangerous.

Isobel unexpectedly returns, leaving Jenna devastated. Bonnie attempts to harness her ancestors' power. Stefan and Damon realise that they have a new weapon.

As the students get ready for a 1960s-themed dance at the school, Elena begins receiving disturbing messages from the ancient vampire Klaus from an unusual source.

Damon reveals that he is willing to go to incredible lengths to protect Elena from falling victim to Klaus's plans. Stefan and Elena spend a romantic day together.

Lives hang in the balance as the consequences of the sacrifice ritual play out.

Klaus takes Stefan to Chicago, where he wants to resuscitate his sister Rebekah, who might hold the key to breaking the curse. Gradually, Stefan is reminded of his Prohibition period affair with her while still bloodthirsty himself, and its tragic end. Tyler is rightly worried, turning for an ally to her mother sheriff Forbes, about the whereabouts of Caroline, whose bully father Bill actually holds her in a dungeon for 'vampire aversion therapy' of the most flagrant kind. Katherine puts Damon on feared Klaus's trail, so he can mount a rescue with Elena after putting her in her place.

In Chicago, Katherine meets Stefan in front of a store and she tells that Elena has the necklace that belongs to Rebekah. She also feels that Stefan is plotting a scheme against Klaus, but he does not share his plan with her. Meanwhile, in Mystic Falls, Anna shows up to Jeremy and talks to him that she is alone in the afterlife. Gloria seeks out the necklace using a spell while Bonnie and Caroline visit Elena; out of the blue, her necklace burns her chest. Damon is upset with people trying to change him to be Mr. Nice Guy. Sheriff Forbes asks him to compel Bill to forget everything but Bill resists. When Damon decides to kill Bill, Caroline protects her father. Meanwhile Gloria tortures Stefan to discover who is wearing the necklace but Katherine unexpectedly kills the witch. Stefan discovers that Klaus fears a vampire hunter, Mikael, and tries to get more information from Rebekah. She's suspicious of his attitude and tells this to Klaus, who decides to return to Mystic Falls.

Bonnie tries to open the coffin and overhears something, but Damon and Stephan arrive in the house and Damon kills the hybrid. Elena and Bonnie are preparing a birthday party for Caroline at school and Jeremy says goodbye for them. Tyler meets Caroline to tell that he would never hurt her since he loves her, but Klaus controls him. Stephan threatens Klaus and asks him to send his hybrids out of Mystic Falls and beheads one hybrid in front of Klaus to prove that he is not kidding. Klaus summons Tyler and compels him to bite Caroline, but Tyler reacts telling that he will not hurt Caroline. When Caroline arrives home, Elena, Bonnie and Matt are waiting for her; however they go to a tomb to celebrate her funeral instead. Out of the blue, Tyler appears and bites Caroline on the neck. Damon and Alaric go to a counsel meeting to raise fund to rebuild a bridge and Damon meets Klaus that tells that Stephan must stop beheading his hybrids. Meanwhile Alaric flirts with Dr. Meredith Fell and protects her against her ex-boyfriend and coroner Dr. Brian Walters. Damon unsuccessfully tries to stop Stephan from killing hybrids. Stephan abducts Elena, calls Klaus, gives her blood to her and promises to kill her, driving his car in high-speed. Klaus agrees to send the hybrids away. Klaus goes to Caroline's home and gives his blood to Caroline and saves her. Damon brings Elena home and on the next morning Jeremy travels to Denver. Alaric meets Dr. Fell while Sheriff Forbes finds Brian murdered.

Now Klaus has Elijah back, they host a dinner party to negotiate a future with the Salvatore brothers, who actually procrastinate. Meanwhile combined witchcraft finally opens the mystery coffin, from which a scary surprise guest is released, but both families will be shocked. Alaric has been wounded dangerously by lover Dr. Fell, who happens to be supernatural, which makes saving him problematic, but Elena steps up. Caroline's father Bill Forbes refuses to survive his vampire bite by allowing Caroline to turn him into one like her.

The present-day murders in Mystic Falls remind Damon of a similar crime spree a century earlier. Flashing back to 1912, Damon recalls a beautiful vampire.

Klaus acts on his intentions to leave town with Elena, but finds resistance from a surprising new enemy. Damon and Stefan have a surprisingly candid conversation about the future.

Determined to protect his sister, Jeremy makes a decision that will change everything; Bonnie makes a secret deal that has heartbreaking consequences.

In the fourth season premiere, Elena awakens after the accident to find the thing she dreaded most has come true. Damon is furious with Stefan, and takes out his rage on Matt.

Stefan and Damon argue about what is best for Elena. Jeremy and Matt are surprised to see a girl they used to know, April (GRACE PHIPPS), enrolling at Mystic Falls High.

Rebekah (CLAIRE HOLT) is back with a vengeance. Bonnie is uncomfortable when her father, Rudy Hopkins (RICK WORTHY - Supernatural), accepts the role of Interim Mayor.

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' new vampires, but they find that Kol has beaten them to it. Kol makes it clear that he will stop at nothing to convince everyone to give up the search for the cure. Looking for a new ally, Rebekah reminds Stefan that they were once close friends. When Sheriff Forbes and Mayor Hopkins question Shane about his involvement in the Founders' Council deaths, Bonnie steps in with questions of her own, and Shane's responses push Bonnie to the edge of her powers. Elena negotiates with Klaus to keep Jeremy safe, but when danger suddenly appears from a totally unexpected enemy, Elena comes up with her own daring plan for Jeremy.

Elena's new outlook has everyone concerned. Damon and Rebekah (CLAIRE HOLT) work together, but his unwanted advice catches her off-guard. Klaus tries to use Hayley (PHOEBE TONKIN).

The Salvatore brothers ask for backup from a surprising source when Elena calls their bluff. Katherine is suspicious when Bonnie makes her an offer.

Someone has been attacking patients at the hospital. A violent wind storm causes a power outage and ghosts suddenly appear - some with good intentions and some bent on revenge.

As the fifth season opens, Elena, after a passionate summer with Damon, heads to college nearby with Caroline as her roommate. Plus, a terrifying appearance by Silas (PAUL WESLEY).

A fellow Whitmore student named Jesse (KENDRICK SAMPSON) gives Elena some intriguing information about Professor Wes Maxfield (RICK COSNETT). Damon asks for help finding Stefan.

Back to Katherine's early life 1490, Nadia helps her mom with a fighting plan.

Elena and Stefan start having dreams about an alternate version of their lives; The Travelers move in on Mystic Falls; Matt has a frightening encounter on 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'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.

Four months have gone by since the Other Side broke down and Bonnie and Damon were lost. Mystic Falls is still a supernatural-free area. Everyone is grieving in their own ways, and some worse than others.

Damon and Bonnie are trying to come up with a way to come back from the otherside, while Stefan tries to help Elena start fresh.

Elena is forced to confront her problems; Liv and Tyler get closer; Damon finds a surprising clue that renews his hope.

Bonnie tries to replicate her favorite traditions, while reminiscing about happier times with her friends; Sheriff Forbes brings holiday cheer to Caroline at Whitmore College; Alaric turns to Damon and Elena for help when Jo goes missing; Tyler approaches Liv and Luke with a risky plan; Jeremy helps Matt carry out a plan to take down Enzo; Stefan is forced to break some devastating news to Caroline.

As Kai learns how to control his magic, he holds Elena captive; Caroline and Stefan go to North Carolina in search of a cure for Sheriff Forbes; Damon realizes Elena has been kidnapped.

Caroline struggles to save her mother. Damon comes up with a daring new plan. Jo and Kai prepare to merge, but Luke intervenes.

Elena and Jeremy reminisce about their past; Caroline and Stefan grow closer; Sheriff Forbes asks Damon for help with a case involving Elena's parents; Enzo lures Matt and Sarah into his plan.

Everybody gathers for the funeral of Liz Forbes. Elena is worried Caroline isn't coping as well as everyone believes.

Stefan concocts a plan to get Caroline to turn her humanity back on. Damon wrestles with what he should do with the cure. Enzo seeks answers.

As Enzo continues to fight the control over him, Bonnie finds herself at the center of a deadly game and forced to make a heart wrenching decision involving two of the most important people in her life. At the Armory, Alaric researches a mysterious artifact that he hopes will help in their fight to get Damon and Enzo back. Finally, Damon's downward spiral leads him to Tyler Lockwood who attempts to talk some sense into him before it's too late.

Sybil puts Damon in a catatonic state for revenge. Caroline and Bonnie enter Damon's mind and realize Stefan is the key to his fate. Sybil competes with her sister for control of the bell.

With the fate of Mystic Falls at stake, Stefan and Damon must fight their greatest enemy for one last battle.