TVD Season 4

Season 4 ( 21-23 )

21- " She's come undone "

Damon and Stefan try a brutal new approach to provoke Elena into turning her humanity back on, and Caroline is frustrated when her attempt to intervene backfires and Elena attempts to kill her. 

When Elena figures out a way to call the Salvatore brothers' bluff, they call on Katherine to create real fear. Katherine has a go, pushing her hand into Elena and grabbing her heart. Then she deliberately leaves the door unlocked so that Elena can escape. 

Matt gives Rebekah some unsolicited advice on her life choices, and she tries to help him in return. Caroline has a confusing and dangerous encounter with Klaus, who turns out to be Silas looking for Bonnie. 

Silas is persistent, and mortally injures Caroline's mother to take her place. Bonnie reaffirms her promise to help Silas open the veil to purgatory, and Caroline has to inject some of her blood into her mother to bring her back to life. 

Katherine is suspicious when Bonnie makes her the offer of Silas's immortality and invulnerability in exchange for the tombstone that Katherine took from the island, which Bonnie needs to lift the veil between our world and purgatory. Katherine appears to accept the deal. 

Meanwhile, the Salvatore brothers use Matt to switch on Elena's humanity, with Damon snapping Matt's neck in front of Elena. He is, of course, wearing the ring that protects him from being killed by supernatural beings, and recovers in the presence of Rebekah. Elena decides that she is going to kill Katherine.

22- "  The walking dead "

As graduation approaches, Caroline tries to distract Elena by focusing on simple tasks like sending out announcements about graduation, but Elena won’t be swayed from her new obsession. 

Sheriff Forbes calls Damon and Stefan to the hospital, where someone has been attacking patients. Still trying to force Katherine to help her, Bonnie refuses to give up on her plan to defeat Silas. 

As a violent wind storm causes a power outage in Mystic Falls, ghosts suddenly appear some with good intentions and some bent on revenge. Bonnie turns Silas into stone and dies trying to bring Jeremy back to life.

23- " Graduation "

On Graduation Day, Mystic Falls is overrun with ghosts intent on settling old scores and fulfilling their supernatural destinies. Damon's life is in danger after a ghostly encounter with one of the hunters, while Matt and Rebekah join forces to battle a ghost determined to find the cure. 

When Matt's life falls in the line of danger Rebekkah kisses him and says that it was the bravest thing she wanted to do. As everyone gathers for the graduation ceremony and the ghosts converge, help comes from the now-hero Klaus, after Caroline repeatedly calls him to help. 

Caroline receives a touching and unexpected graduation present from him: He gives Tyler his freedom back, allowing him to return to Mystic Falls to be with Caroline. He tells her that though Tyler is her first love, he wants to be the last one she ever loves. 

Then Bonnie bravely gives her own life to bring Jeremy back but ensures she'll be fine with her Grams, and the Spirits of Witches. Elena then tells Damon that she loves him and in death he is the only one who makes her feel alive. 

They kiss passionately as Stefan overhears the conversation with tears in his eyes. Elena faces Katherine which eventually leads to Elena shoving the cure down Katherine's throat, turning her back into a human. Finally, Stefan discovers a horrifying clue to the mystery surrounding Silas: Stefan is Silas' doppelganger. Then a vengeful Silas traps Stefan in a safe and drops him into the lake.