TV Castle - Season 8 Episode 1 : XY (1) Castle - Season 8 Episode 1 : XY (1) 7.975/10 by 2009 users After passing the Captain's exam last season, Beckett was surprised with an offer to run for State Senate. In the action packed season premiere, Castle and Beckett are adjusting to Beckett's career change, when a call from a mysterious stranger sets off an explosive chain of events. There are two sides to every story, and this unique two-parter will explore the same story from each of their perspectives, first from Castle's side as he searches for Beckett. Details Casts Posters Images Title Castle - Season 8 Episode 1 : XY (1) Alternative Titles Касъл, Castke, Κάστρο, کسل First Air Date 2009-03-09 Last Air Date 2016-05-16 Number of Episodes 173 Number of Seasons 8 Genres Drama, Crime, Networks ABC, Casts Nathan Fillion, Stana Katic, Molly C. Quinn, Jon Huertas, Seamus Dever, Susan Sullivan, Tamala Jones, Toks Olagundoye Plot Keywords , Richard Castle Nathan Fillion Kate Beckett Stana Katic Alexis Castle Molly C. Quinn Javier Esposito Jon Huertas Kevin Ryan Seamus Dever Martha Rodgers Susan Sullivan Lanie Parish Tamala Jones Hayley Shipton Toks Olagundoye Episodes List Castle Season 8 :Episode 1 XY (1) XY (1) 2015-09-21 After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle receives permission from the Mayor of New... Castle Season 8 :Episode 2 XX (2) XX (2) 2015-09-28 After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle receives permission from the Mayor of New... Castle Season 8 :Episode 3 PhDead PhDead 2015-10-05 After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle receives permission from the Mayor of New... Castle Season 8 :Episode 4 What Lies Beneath What Lies Beneath 2015-10-12 After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle receives permission from the Mayor of New... Castle Season 8 :Episode 5 The Nose The Nose 2015-10-19 After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle receives permission from the Mayor of New... Castle Season 8 :Episode 6 Cool Boys Cool Boys 2015-11-09 After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle receives permission from the Mayor of New... Castle Season 8 :Episode 7 The Last Seduction The Last Seduction 2015-11-16 After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle receives permission from the Mayor of New... Castle Season 8 :Episode 8 Mr. & Mrs. Castle Mr. & Mrs. Castle 2015-11-23 After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle receives permission from the Mayor of New... Castle Season 8 :Episode 9 Tone Death Tone Death 2016-02-08 After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle receives permission from the Mayor of New... Castle Season 8 :Episode 10 Witness for the Prosecution Witness for the Prosecution 2016-02-14 After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle receives permission from the Mayor of New... Castle Season 8 :Episode 11 Dead Red Dead Red 2016-02-15 After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle receives permission from the Mayor of New... Castle Season 8 :Episode 12 The Blame Game The Blame Game 2016-02-22 After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle receives permission from the Mayor of New... Castle Season 8 :Episode 13 And Justice for All And Justice for All 2016-02-29 After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle receives permission from the Mayor of New... Castle Season 8 :Episode 14 The G.D.S. The G.D.S. 2016-03-07 After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle receives permission from the Mayor of New... Castle Season 8 :Episode 15 Fidelis Ad Mortem Fidelis Ad Mortem 2016-03-21 After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle receives permission from the Mayor of New... Castle Season 8 :Episode 16 Heartbreaker Heartbreaker 2016-04-04 After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle receives permission from the Mayor of New... Castle Season 8 :Episode 17 Death Wish Death Wish 2016-04-11 After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle receives permission from the Mayor of New... Castle Season 8 :Episode 18 Backstabber Backstabber 2016-04-18 After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle receives permission from the Mayor of New... Castle Season 8 :Episode 19 Dead Again Dead Again 2016-04-25 After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle receives permission from the Mayor of New... Castle Season 8 :Episode 20 Much Ado About Murder Much Ado About Murder 2016-05-02 After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle receives permission from the Mayor of New... Castle Season 8 :Episode 21 Hell to Pay Hell to Pay 2016-05-09 After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle receives permission from the Mayor of New... Castle Season 8 :Episode 22 Crossfire Crossfire 2016-05-16 After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle receives permission from the Mayor of New...