By the Light of the Moon (S02E11)

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) 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) makes an unexpected appearance with an offer that could change everything. (Warner Bros. UK)