Elena is still emotionless in The Vampire Diaries Season 4, Episode 21, “She’s Come Undone.” Stefan and Damon try an extreme new way to flip the humanity switch. Caroline tries to stop them, which backfires. She also has a dangerous interaction with Klaus. Elena tests how far the brothers are willing to go, and help comes from an unexpected source. Rebekah and Matt try to help each other out. Bonnie (Kat Graham) offers to help Katherine (Nina Dobrev). Read the full recap here.