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- Season 8 overviewSep 21, 2015-May 16, 201622 episodesSeason 8 episodes1. XY Sep 21, 2015
- A call from a mysterious stranger ignites an explosive chain of events; Castle searches for Beckett.
- 2. XX Sep 28, 2015
- Beckett receives a mysterious tip and is launched into a fight for her life.
- 3. PhDead Oct 5, 2015
- Castle poses as a college professor so he can investigate a student's gruesome murder.
- 4. What Lies Beneath Oct 12, 2015
- Castle is determined to figure out who murdered his idol, a reclusive author.
- 5. The Nose Oct 19, 2015
- Castle and Beckett track down a killer who stole a priceless piece of art.
- 6. Cool Boys Nov 9, 2015
- Detective Slaughter asks Castle for help solving a high-stakes robbery case.
- 7. The Last Seduction Nov 16, 2015
- The brutal murder of a lothario prompts an investigation into New York's elite.
- 8. Mr. & Mrs. Castle Nov 23, 2015
- Castle and Becket investigate the murder of a cruise ship entertainer.
- 9. Tone Death Feb 8, 2016
- Castle and Beckett investigate when a corpse is discovered in the theater of Martha's latest show.
- 10. Witness for the Prosecution Feb 14, 2016
- New information arises during a trial, forcing Beckett to race to prevent a miscarriage of justice.
- 11. Dead Red Feb 15, 2016
- The son of a Russian diplomat is slain; a security guard is more involved in the case than expected.
- 12. The Blame Game Feb 21, 2016
- Castle is abducted and forced to solve deranged puzzles and mind games with strangers.
- 13. And Justice for All Feb 29, 2016
- When a student who takes English as a second language is murdered, Castle goes under cover.
- 14. The G.D.S. Mar 7, 2016
- Castle goes to Los Angeles in hopes of finding answers about the time he cannot remember.
- 15. Fidelis Ad Mortem Mar 21, 2016
- Beckett returns to her NYPD training ground to investigate the murder of a recruit officer.
- 16. Heartbreaker Apr 4, 2016
- The death of an armored-car driver leads Beckett and Castle to one of Esposito's old cases.
- 17. Death Wish Apr 11, 2016
- Castle and Beckett search for a stolen antique that may have been Aladdin's lamp.
- 18. Backstabber Apr 18, 2016
- Hayley finds herself being implicated in a cyber-terror attack after doing an old friend a favor.
- 19. Dead Again Apr 25, 2016
- A city safety inspector survives being poisoned, then tries to help Castle with the investigation.
- 20. Much Ado About Murder May 2, 2016
- When a movie star turned stage actor is mysteriously killed, Castle goes backstage to investigate.
- 21. Hell to Pay May 9, 2016
- Castle thinks the death of an escaped psychiatric inmate might be the work of the Antichrist.
- 22. Crossfire May 16, 2016
- Castle and Beckett have their lead and are ready to face LokSat.