Lauren Cohan

Noticing that everyone is too busy on their electronic devices to actually interact with one another, Claire and Phil declare a family challenge to see who can stay unplugged the longest. Meanwhile, it's a race against the clock as Mitchell and Cameron frantically try to get Lily into the best pre-schools, and Jay and Manny are concerned about how far Gloria will go to alleviate their problem with the neighbor's barking dog.

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 newfound confidant to help him try to discover the real purpose and power of the moonstone. Jeremy and Bonnie meet Luka Martin (guest star Bryton James – The Young and the Restless, Family Matters), a new student with a surprising family history.

As the full moon approaches, Caroline helps Tyler prepare for the transformation he is powerless to stop. While Stefan and Katherine play mind games on one another, Damon and Alaric are suspicious when a stranger named Jules (recurring guest star Michaela McManus – One Tree Hill, Law & Order: Special Victims Unit) shows up in Mystic Falls, searching for her missing friend, Mason. Elena is frustrated at the lengths Jeremy and her friends have gone to in order to keep her safe. Bonnie and Luca (recurring guest star Bryton James) work together on a spell, while still keeping secrets from one another. Finally, Elijah (recurring guest star Daniel Gillies – Spider-Man 2) makes an unexpected appearance with an offer that could change everything.

Stefan and Damon come to Elena's assistance and, in the process, learn surprising new information about people, vampires and events in the distant past. Jeremy helps Bonnie after she casts a difficult and exhausting spell, and Caroline does what she can to make things easier for Tyler. Plus, Stefan and Damon reach a new understanding.

Elena decides to take matters into her own hands and offers a tempting incentive to Rose (recurring guest star Lauren Cohan) for her help. When things take an unexpected turn, however, Rose calls on Damon to deal with the plan Elena has set in motion. Jeremy's reckless attempt to help Bonnie retrieve the moonstone lands him in a life-threatening position and forces Stefan to put himself in danger. Meanwhile, Bonnie and Luka (recurring guest star Bryton James) form a closer connection, and Tyler shows Caroline the Lockwood cellar, where she makes a discovery that leaves them both terrified.