The CW has released their official description for the December 9 episode of The Vampire Diaries.

TYLER FACES HIS FIRST TRANSFORMATION — As the full moon approaches, Caroline (Candice Accola) helps Tyler (Michael Trevino) prepare for the transformation he is powerless to stop. While Stefan (Paul Wesley) and Katherine (Nina Dobrev) play mind games on one another, Damon (Ian Somerhalder) and Alaric (Matt Davis) are suspicious when a stranger named Jules (guest star Michaela McManus) shows up in Mystic Falls, searching for her missing friend, Mason. Elena (Dobrev) is frustrated at the lengths Jeremy (Steven R. McQueen) and her friends have gone to in order to keep her safe. Bonnie (Katerina Graham) and Luca (guest star Bryton James) work together on a spell, while still keeping secrets from one another. Finally, Elijah (guest star Daniel Gillies) makes an unexpected appearance with an offer that could change everything. Sara Canning and Zach Roering also star.. Posted on VampireSite.net. Elizabeth Allen directed the episode written by Mike Daniels (#201).