The Vampire Diaries - Season 2 – Validated

: Katherine returns to Mystic Falls with a plan to use Elena Gilbert to break a centuries-old curse involving a moonstone, vampires, and werewolves.

: The Lockwood family curse is triggered when Tyler Lockwood accidentally kills a peer, leading to his first transformation and the introduction of his uncle, Mason Lockwood. Major Character Evolutions The Vampire Diaries - Season 2

: His character deepens as he struggles with his humanity and his unrequited love for Elena . : Katherine returns to Mystic Falls with a

: The season introduces Elijah and Klaus Mikaelson , the world's first vampires. Klaus , a vampire-werewolf hybrid, serves as the season’s primary antagonist. : The season introduces Elijah and Klaus Mikaelson

: Forced to face her heritage as a Petrova doppelgänger, Elena becomes more active in her own survival, eventually sacrificing herself (and being brought back) during Klaus's ritual. Episode Guide

The season consists of 22 episodes that aired on from September 2010 to May 2011. Saying Farewell to 'The Vampire Diaries' | The Nerd Daily