On this week's episode of The Vampire Diaries, Stefan developed a serious drinking problem.

Because there's no AA for blood suckers, next Thursday's "Under Control" will focus on Stefan's struggle to control his newfound, dangerous desires. Also on tap:

• David Anders debuts as Uncle John Gilbert.
• Alaric discuss Isobel with Elena.
• Matt has issues with Tyler and with his mother.

Check out the official promo for the episode below, as Damon teases that there's "another part to this" and the screen tells us SOMETHING BIG IS GOING DOWN.

[video url="http://www.tvfanatic.com/videos/under-control-promo/" title="Under Control Promo"] [/video]

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