What should viewers expect on this Thursday's new episode of The Vampire Diaries?

David Anders shows up as Elena and Jeremy's uncle, John. Stefan tries to control his new thirst for human blood. And a full moon causes serious problems for Tyler.

As always, we'll recap "Under Control" and review it in depth soon after it airs. You can sneak a peek at the official CW promo for the episode now, and check out a slew of photos from it below:

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.