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

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When a confused and desperate Caroline leaves the hospital and joins her friends at the Mystic Falls Carnival, Damon wants to take immediate action.

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Katherine recalls the past.

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

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

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Stefan and Damon decide on a new plan to deal with Katherine at the masquerade ball.

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Stefan and Damon come to Elena's assistance and, in the process, learn surprising new information.

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Elena puts herself in a dangerous position as she searches for the truth about Katherine's past and what her own future may hold. Knowing that Stefan would never agree to her plan, Elena swears Caroline to secrecy. Damon uses a new-found confidant to help him try to discover the real purpose and power of the moonstone. Jeremy and Bonnie meet Luka, a new student with a surprising family history.

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As the full moon nears, Caroline helps Tyler prepare for his transformation. Meanwhile, Damon and Alaric are suspicious when a stranger shows up looking for Mason.

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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.

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Stefan tells Elena about his darkest days. Trying to catch Elijah off guard, Damon arranges a dinner party.

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

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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.

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Stefan and Damon are angry when they find out that Elena has taken matters into her own hands in the battle against Klaus. Tensions also rise between the brothers over the best way to protect her.

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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.

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Despite an unanticipated act of courage, events spin out of control in a frightening way, but sadly Matt isn't a sacrifice, again.

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Lives hang in the balance as the consequences of the sacrifice ritual play out. Matt survives and continues to annoy us.

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These are my thoughts on Season 2 of The Vampire Diaries.