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Sucker Punch is the thirteenth episode of the second season of Castle, and the twenty-third episode overall.
Starring: Nathan Fillion (Richard "Rick" Castle), Stana Katic (Detective Kate Beckett), Susan Sullivan (Martha Rogers), Ruben Santiago-Hudson (Captain Roy Montgomery), Molly Quinn (Alexis Castle), Jon Huertas (Detective Javier Esposito), Tamala Jones (M.E. Lanie Parish), Seamus Dever (Detective Kevin Ryan)
Guest Starring: Jay R. Ferguson (Dick Coonan), Danny Nucci (Gilbert Mazzara), John Brantley Cole, Jr. (Officer Clayton Lee), James Cosmo (Finn Rourke), Scott Paulin (Jim Beckett), Robert Picardo (Dr. Clark Murray), Eddie Shin (Johnny Vong), Patrick St. Esprit (Emmett Forrest), Jenna Leigh Green (Molly)
While investigating the murder of an Irish mobster hitman, forensic evidence indicates that the killer is the same person who killed Beckett's mother.