Season
Episode
- Episode 1: XY (1)
- Episode 2: XX (2)
- Episode 3: PhDead
- Episode 4: What Lies Beneath
- Episode 5: The Nose
- Episode 6: Cool Boys
- Episode 7: The Last Seduction
- Episode 8: Mr. & Mrs. Castle
- Episode 9: Tone Death
- Episode 10: Witness for the Prosecution
- Episode 11: Dead Red
- Episode 12: The Blame Game
- Episode 13: And Justice for All
- Episode 14: The G.D.S.
- Episode 15: Fidelis Ad Mortem
- Episode 16: Heartbreaker
- Episode 17: Death Wish
- Episode 18: Backstabber
- Episode 19: Dead Again
- Episode 20: Much Ado About Murder
- Episode 21: Hell to Pay
- Episode 22: Crossfire
Castle Season 8 PhDead
After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle receives permission from the Mayor of New York City to tag along with an NYPD homicide investigation team for research purposes.
