TV Castle - Season 3 Episode 6 : 3XK Castle - Season 3 Episode 6 : 3XK 7.975/10 by 2009 users When a beautiful woman is found dead in an alley, all clues point to her being a victim of the notorious Triple Killer. The Triple Killer, or 3XK, terrorized New York City four years ago, then mysteriously disappeared. Now he's back. In a deadly battle of wits, Castle and Beckett race against time to stop 3XK before he claims his next victims. Details Casts Posters Images Title Castle - Season 3 Episode 6 : 3XK 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 3 :Episode 1 A Deadly Affair A Deadly Affair 2010-09-20 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 3 :Episode 2 He's Dead, She's Dead He's Dead, She's Dead 2010-09-27 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 3 :Episode 3 Under the Gun Under the Gun 2010-10-04 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 3 :Episode 4 Punked Punked 2010-10-11 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 3 :Episode 5 Anatomy of a Murder Anatomy of a Murder 2010-10-18 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 3 :Episode 6 3XK 3XK 2010-10-25 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 3 :Episode 7 Almost Famous Almost Famous 2010-11-01 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 3 :Episode 8 Murder Most Fowl Murder Most Fowl 2010-11-08 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 3 :Episode 9 Close Encounters of the Murderous Kind Close Encounters of the Murderous Kind 2010-11-15 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 3 :Episode 10 Last Call Last Call 2010-12-06 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 3 :Episode 11 Nikki Heat Nikki Heat 2011-01-03 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 3 :Episode 12 Poof! You're Dead Poof! You're Dead 2011-01-10 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 3 :Episode 13 Knockdown Knockdown 2011-01-24 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 3 :Episode 14 Lucky Stiff Lucky Stiff 2011-02-07 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 3 :Episode 15 The Final Nail The Final Nail 2011-02-14 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 3 :Episode 16 Setup (1) Setup (1) 2011-02-21 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 3 :Episode 17 Countdown (2) Countdown (2) 2011-02-28 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 3 :Episode 18 One Life to Lose One Life to Lose 2011-03-21 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 3 :Episode 19 Law & Murder Law & Murder 2011-03-28 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 3 :Episode 20 Slice of Death Slice of Death 2011-04-04 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 3 :Episode 21 The Dead Pool The Dead Pool 2011-04-11 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 3 :Episode 22 To Love and Die in L.A. To Love and Die in L.A. 2011-05-02 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 3 :Episode 23 Pretty Dead Pretty Dead 2011-05-09 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 3 :Episode 24 Knockout Knockout 2011-05-16 After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle receives permission from the Mayor of New...