the vampire diaries episode 4x21

Stefan, Elena, and Damon in Vampire Diaries Season 4, Episode 21: “She’s Come Undone!”
Damon and Stefan try a brutal new approach to provoke Elena into turning her humanity back on, and Caroline is frustrated when her attempt to intervene backfires. When Elena figures out a way to call the Salvatore brothers’ bluff, they call for backup from a surprising source. Matt gives Rebekah some unsolicited advice on her life choices, and she tries to help him in return. Caroline has a confusing and dangerous encounter with Klaus, and Katherine is suspicious when Bonnie makes her an offer that she promises will benefit them both.

Original Air Date: May 2, 2013 at 8 p.m. on The CW!