Season two focuses on the return of Elena Gilbert's (Nina Dobrev) doppelgänger, Katherine Pierce, the introduction of werewolves, the sun and moon curse, and the arrival of the original vampires.Tyler Lockwood's (Michael Trevino) uncle, Mason Lockwood (Taylor Kinney), arrives in town searching for the moonstone, a family heirloom. Meanwhile, Caroline Forbes (Candice Accola) is killed by Katherine while having Damon Salvatore's (Ian Somerhalder) blood in her system, turning her into a vampire.The arrival of the original vampires, Elijah (Daniel Gillies) and Klaus Mikaelson (Joseph Morgan), also bring about complications.
Therefore, Klaus arrives in town with plans to break the curse and unleash his werewolf side by channelling the power of the full moon into the moonstone, sacrificing a vampire and a werewolf, and drinking the blood of the doppelgänger.
The season is currently on air in Urdu on filmax channel in Pakistan.
It became available on DVD and Blu-ray on August 30, 2011.
Picking up where the first season left off, Elena arrives home to discover the fates of Uncle John and Jeremy.
Jeremy has not transitioned into a vampire, because he did not take enough drugs to die and Anna's blood overcame the overdose.
Damon, Bonnie, and Elena agree that Caroline needs Damon's blood to survive.
Damon realizes that Katherine has returned and is impersonating Elena.
Tyler is surprised when his uncle, Mason Lockwood, arrives in town to console him.
Katherine and Damon nearly sleep together, but Katherine tells Damon, "it will always be Stefan".
Distraught, Damon goes to see Elena, who resists his attempt to kiss her.
Angry that Elena also loves Stefan, Damon snaps Jeremy's neck.