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Backstabber is the eighteenth episode of the eighth season of Castle, and the one hundred sixty-ninth episode overall.
Starring: Nathan Fillion (Richard Castle), Stana Katic (Detective Kate Beckett), Susan Sullivan (Martha Rogers), Jon Huertas (Detective Javier Esposito), Seamus Dever (Detective Kevin Ryan), Tamala Jones (M.E. Lanie Parish), Molly C. Quinn (Alexis Castle), Toks Olagundoye (Hayley Shipton)