Peter Hale is back from the dead. This is a photo from the Teen Wolf episode "Party Guessed.'
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Lydia's birthday party doesn't go exactly as planned on Teen Wolf. "Party Guessed" is the ninth episode of the show's second season.
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Teen Wolf Season 2 Episode 9 Quotes

Your wife is already dead. That thing over there is just a cocoon waiting to hatch.

Gerard

Lydia: Are you real?
Peter: Interestingly, that question can also be answered not yet.