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But you, Lydia, you're not a sacrifice. You're just a girl who knows too much.
Actually, a girl who knew too much.
Jennifer to Lydia before she attempts to kill her.

"The Girl Who Knew Too Much" is the ninth episode of Season 3 of Teen Wolf and the thirty-third episode overall. It first aired on July 29, 2013 on MTV.

Overview Edit

Allison becomes suspicious of someone close to her. Lydia's true nature is revealed. The Darach's identity is exposed.

Synopsis Edit

Cast and characters Edit

Actor Character
Tyler Posey Scott McCall
Crystal Reed Allison Argent
Dylan O'Brien Stiles Stilinski
Tyler Hoechlin Derek Hale
Holland Roden Lydia Martin
Character debut
Character final
Character only


Production notes Edit

Transcript Edit

Series continuity Edit

Character revelations Edit

  • Lydia is revealed to be a Banshee.
  • Jennifer Blake is revealed to be the Darach.

Etymology Edit

Due to her drawings of the Nemeton, Jennifer declared Lydia to be a girl who knew too much and attempted to kill her.

Soundtrack Edit

Trivia Edit

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