Castle is an American comedy-drama television series broadcast on ABC and produced by ABC Studios. Castle premiered on March 9, 2009, and the final episode of the third season aired on May 16, 2011. On January 10, 2011, Castle was renewed for a fourth season 4.

Castle follows Nathan Fillion as Richard Castle, a famous mystery novelist who has killed off his main character in his book series and has writer’s block. He is called in to help the NYPD solve a copy-cat murder based on one of his novels. Stana Katic co-stars as Detective Kate Beckett. Castle, who becomes interested in Beckett as a potential character for a new book series, uses his connections at the mayor’s office and receives permission to continue accompanying Beckett while investigating cases. Castle decides to use Beckett as the model for the main character of his next book series starring “Nikki Heat”. Beckett, an avid reader of Castle’s books, initially disapproves of having Castle shadow her on her cases, but later warms up and recognizes Castle as a useful resource in solving crimes.

Main Cast:
* Nathan Fillion as Richard Castle
* Stana Katic as Det. Kate Beckett
* Molly C. Quinn as Alexis Castle
* Ruben Santiago-Hudson as Capt. Roy Montgomery
* Susan Sullivan as Martha Rodgers
* Seamus Dever as Kevin Ryan
* Jon Huertas as Javier Esposito
* Tamala Jones as Lanie Parish

Season 1
Season 2
Season 3
1. Episode 1: A Deadly Affair — 20 September 2010
2. Episode 2: He's Dead, She's Dead — 27 September 2010
3. Episode 3: Under the Gun — 4 October 2010
4. Episode 4: Punked—11 October 2010
5. Episode 5: Anatomy of a Murder—18 October 2010
6. Episode 6: 3XK —25 October 2010
7. Episode 7: Almost Famous—1 November 2010
8. Episode 8: Murder Most Fowl — 8 November 2010
9. Episode 9: Close Encounters of the Murderous Kind — 15 November 2010
10. Episode 10: Last Call — 6 December 2010
11. Episode 11: Nikki Heat — 3 January 2011
12. Episode 12: Poof, You're Dead — 10 January 2011
13. Episode 13: Knockdown — 24 January 2011
14. Episode 14: Lucky Stiff — 7 February 2011
15. Episode 15: The Final Nail — 14 February 2011
16. Episode 16: Setup — 21 February 2011
17. Episode 17: Countdown — 28 February 2011
18. Episode 18: One Life to Lose — 21 March 2011
19. Episode 19: Law & Murder — 28 March 2011
20. Episode 20: Slice of Death — 4 April 2011
21. Episode 21: The Dead Pool — 11 April 2011
22. Episode 22: To Love and Die in L.A. — 2 May 2011
23. Episode 23: Pretty Dead — 9 May 2011
24. Episode 24: Knockout — 16 May 2011

Season 4
1. Episode 1: Rise — 19 September 2011
2. Episode 2: Heroes and Villains — 26 September 2011
3. Episode 3: Head Case — 3 October 2011
4. Episode 4: Kick the Ballistics — 10 October 2011
5. Episode 5: Eye of the Beholder — 17 October 2011
6. Episode 6: Demons —2 4 October 2011
7. Episode 7: Cops & Robbers — 31 October 2011
8. Episode 8: Heartbreak Hotel — 7 November 2011
9. Episode 9: Kill Shot — 21 November 2011
10. Episode 10: Cuffed — 5 December 2011
11. Episode 11: Til Death Do Us Part
12. Episode 12: Dial M for Mayor
13. Episode 13: An Embarrassment of Bitches
14. Episode 14: Celebrity Breeds Contempt