1. XY
Aired: Sep 21, 2015 A call from a mysterious stranger ignites an explosive chain of events; the s...
2. XX
Aired: Sep 28, 2015 Beckett receives a tip and ends up launched into a fight for her life with me...
3. PhDead
Aired: Oct 5, 2015 Castle poses as a college professor so he can investigate the gruesome murder...
4. What Lies Beneath
Aired: Oct 12, 2015 When Castle's idol, a famously reclusive author, turns up dead, Castle is det...
5. The Nose
Aired: Oct 19, 2015 When a priceless work of art is stolen and its transporter murdered, Castle a...
6. Cool Boys
Aired: Nov 9, 2015 While Beckett is out of town, Castle becomes involved with Detective Slaughte...
7. The Last Seduction
Aired: Nov 16, 2015 In order to hunt down the brutal murderer of a grifting seducer, Castle and B...
8. Mr. & Mrs. Castle
Aired: Nov 23, 2015 Castle and Beckett investigate the murder of a cruise ship entertainer, only ...
9. Tone Death
Aired: Feb 8, 2016 When a corpse is discovered in the theater of Martha's latest show, Castle an...
10. Witness for the Prosecution
Aired: Feb 14, 2016 When Castle takes the stand as the key witness to a murder new information su...
11. Dead Red
Aired: Feb 15, 2016 The son of a Russian diplomat is murdered; during the investigation Castle en...
12. The Blame Game
Aired: Feb 22, 2016 When Castle and Beckett are abducted and forced to solve deranged puzzles and...
13. And Justice for All
Aired: Feb 29, 2016 Beckett and the 12th Precinct look into the murder of an English as a Second ...
14. G.D.S.
Aired: Mar 7, 2016 Castle returns to L.A to find out more about the missing time related to his ...
15. Fidelis Ad Mortem
Aired: Mar 21, 2016 Castle tells Beckett of the video he found of himself in Hollywood. Meanwhile...
16. Heartbreaker
Aired: Apr 4, 2016 After an armored car driver is killed and some of the money it was carrying s...
17. Death Wish
Aired: Apr 11, 2016 Castle and Beckett search for a stolen antique that may have been Aladdin's l...
18. Backstabber
Aired: Apr 18, 2016 After Hayley does a favor for an old friend, she finds herself implicated in ...
19. Dead Again
Aired: Apr 25, 2016 When a mild mannered safety inspector for the city survives a poisoning, it m...
20. Much Ado About Murder
Aired: May 2, 2016 Castle and Beckett team up to find the killer of a celebrity who was in town ...
21. Hell to Pay
Aired: May 9, 2016 Castle thinks the Antichrist may be involved in the death of an axe-wielding,...
22. Crossfire
Aired: May 16, 2016 Castle and Beckett have their lead and are ready to face LokSat, but an unexp...