More than one life hangs in the balance as the consequences of the sacrifice ritual play out to a horrifying conclusion.
As the full moon arrives, Elena prepares for whatever Klaus has planned and Tyler faces his second transformation.
Damon is willing to go to great lengths to prevent Elena from being a victim of Klaus's plan to break the curse, putting him at odds with Stefan.
Klaus is revealed and Elena learns shocking news about his motives. Plus, flashbacks to 1491 reveal Katherine's introduction to Elijah and Klaus.
Elena receives disturbing messages from Klaus. Expecting him to show up at the 1960s Decade Dance, Damon and Alaric attend as chaperones.
Elena and Alaric lash out at John when Isobel's unexpected arrival leaves Jenna devastated. Stefan and Damon realize they have a new secret weapon.
Stefan and Bonnie try to convince Jonas and Luka that they should all be working together, but Jonas's lack of trust leads to a violent confrontation.
Stefan tells Elena about his darkest days. Trying to catch Elijah off guard, Damon arranges a dinner party for him with Jenna, Alaric and Andie.
Stefan and Elena attempt a romantic weekend getaway, not realizing that they've been followed. Damon attends a tea at the Historical Society.
Johnathan Gilbert's return to Mystic Falls is an unhappy surprise to Elena, Jenna and Damon. Stefan does his best to reach out to a confused Tyler.
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.
As the full moon nears, Caroline helps Tyler prepare for transformation. Damon and Alaric are suspicious when a stranger shows up looking for Mason.
Elena puts herself in a dangerous position searching for the truth about Katherine's past.
Stefan and Damon decide on a new plan to deal with Katherine at the masquerade ball. Things take an ugly turn when Matt and Tyler start doing shots.
Katherine chooses a new victim. Bonnie discovers new information about Mason and shares it with Stefan.
Tyler learns more about the Lockwood family curse from Mason, and Sheriff Lockwood receives startling information.