Stefan: I'm clean.
Damon: You're lying.
Stefan: Believe what you want.

Our favorite blood-sucking pair of brothers have the above exchange on the April 22 episode of The Vampire Diaries, "Miss Mystic Falls."

As you can tell, the hour centers on Stefan's dangerous addiction, while it also features Elena and Caroline taking part in the Founder's Day Gala. In the following clip, Damon confronts his sibling and questions the "pep in his step."

[video url="http://www.tvfanatic.com/videos/stefan-vs-damon/" title="Stefan vs. Damon"] [/video]

Also on tap: Bonnie returns and Uncle John attempts to intimidate Damon.

Remember to visit our Vampire Diaries spoilers section for a complete look at what's ahead on the show, and enjoy another sneak peek below.

[video url="http://www.tvfanatic.com/videos/miss-mystic-falls-clip/" title="Miss Mystic Falls Clip"] [/video]

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