Watch Castle Online. 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. Castle is called in to help the NYPD solve a copy-cat murder based on one of his novels. Stana Katic stars opposite as the determined detective Kate Beckett. Castle, who becomes interested in Beckett as a potential character for a new book series, uses his contacts 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, is initially disapproving of having Castle shadow her on her cases, but later warms up and recognizes Castle as a useful resource in solving crimes. While technically a drama series, Castle also features comedy and romantic tension.

Episode List

Season 5

• Castle Season 5 Episode 24 – Watershed
• Castle Season 5 Episode 23 – The Human Factor
• Castle Season 5 Episode 22 – Still
• Castle Season 5 Episode 21 – The Squab and the Quail
• Castle Season 5 Episode 20 – The Fast and the Furriest
• Castle Season 5 Episode 19 – The Lives of Others
• Castle Season 5 Episode 18 – The Wild Rover
• Castle Season 5 Episode 17 – Scared To Death
• Castle Season 5 Episode 16 – Hunt
• Castle Season 5 Episode 15 – Target
• Castle Season 5 Episode 14 – Reality Star Struck
• Castle Season 5 Episode 13 – Redemption
• Castle Season 5 Episode 12 – Death Gone Crazy
• Castle Season 5 Episode 11 – Under The Influence
• Castle Season 5 Episode 10 – Significant Others
• Castle Season 5 Episode 9 – Secret Santa
• Castle Season 5 Episode 8 – After Hours
• Castle Season 5 Episode 7 – Swan Song
• Castle Season 5 Episode 6 – The Final Frontier
• Castle Season 5 Episode 5 – Probable Cause
• Castle Season 5 Episode 4 – Murder, He Wrote
• Castle Season 5 Episode 3 – Secret’s Safe With Me
• Castle Season 5 Episode 2 – Cloudy With a Chance of Murder
• Castle Season 5 Episode 1 - After the Storm
  

Season 4

• Castle Season 4 Episode 23 – Always
• Castle Season 4 Episode 22 – Undead Again
• Castle Season 4 Episode 21 – Headhunters
• Castle Season 4 Episode 20 – The Limey
• Castle Season 4 Episode 19 – 47 Seconds
• Castle Season 4 Episode 18 – A Dance with Death
• Castle Season 4 Episode 17 – Once Upon A Crime
• Castle Season 4 Episode 16 – Linchpin
• Castle Season 4 Episode 15 – Pandora
• Castle Season 4 Episode 14 – The Blue Butterfly
• Castle Season 4 Episode 13 – An Embarrassment of Bitches
• Castle Season 4 Episode 12 – Dial M for Mayor
• Castle Season 4 Episode 11 – Till Death Do Us Part
• Castle Season 4 Episode 10 – Cuffed
• Castle Season 4 Episode 9 – Kill Shot
• Castle Season 4 Episode 8 – Heartbeak Hotel
• Castle Season 4 Episode 7 – Cops & Robbers
• Castle Season 4 Episode 6 – Demons
  
• Castle Season  4 Episode 5 – Eye of the Beholder
• Castle Season 4 Episode 4 – Kick the Ballistics
• Castle Season 4 Episode 3 – Head Case
• Castle Season 4 Episode 2- Heroes and Villains
• Castle Season 4 Episode 1 – Rise

Season 3

• Castle Season 3 Episode 24 – Knockout
• Castle Season 3 Episode 23 – Pretty Dead
• Castle Season 3 Episode 22 - To Love and Die in L.A
• Castle Season 3 Episode 21 – The Dead Pool
• Castle Season 3 Episode 20 – Slice of Death
• Castle Season 3 Episode 19 – Law & Murder
• Castle Season 3 Episode 18 – One Life to Lose
• Castle Season 3 Episode 17 – Countdown
• Castle Season 3 Episode 16 – Set Up
• Castle Season 3 Episode 15 – The Final Nail
  
• Castle Season 3 Episode 14 – Lucky Stiff
• Castle Season 3 Episode 13 – Knockdown
• Castle Season 3 Episode 12 – Poof! You’re Dead
• Castle Season 3 Episode 11 – Nikki Heat
• Castle Season 3 Episode 10 – Last Call
• Castle Season 3 Episode 9 – Close Encounters of the Murderous Kind
• Castle Season 3 Episode 8 – Murder Most Fowl
• Castle Season 3 Episode 7 – Almost Famous
• Castle Season 3 Episode 6 – 3XK
• Castle Season 3 Episode 5 – Anatomy of a Murder
• Castle Season 3 Episode 4 – Punked
• Castle Season 3 Episode 3 – Under the Gun
• Castle Season 3 Episode 2 – He’s Dead, She’s Dead
• Castle Season 3 Episode 1 – A Deadly Affair

Season 2

• Castle Season 2 Episode 24 – A Deadly Game
• Castle Season 2 Episode 23 – Overkill
• Castle Season 2 Episode 22 – Food to Die For
• Castle Season 2 Episode 21 – Den of Thieves
• Castle Season 2 Episode 20 – The Late Shaft
• Castle Season 2 Episode 19 – Wrapped Up in Death
• Castle Season 2 Episode 18 – Boom!
• Castle Season 2 Episode 17 – Tick, Tick, Tick…
• Castle Season 2 Episode 16 – The Mistress Always Spanks Twice
• Castle Season 2 Episode 15 – Suicide Squeeze
• Castle Season 2 Episode 14 – The Third Man
• Castle Season 2 Episode 13 – Sucker Punch
• Castle Season 2 Episode 12 – A Rose for Everafter
• Castle Season 2 Episode 11 – The Fifth Bullet
• Castle Season 2 Episode 10 – One Man’s Treasure
• Castle Season 2 Episode 9 – Little Girl Lost
• Castle Season 2 Episode 8 – Kill the Messenger
• Castle Season 2 Episode 7 – Famous Last Words
• Castle Season 2 Episode 6 – Vampire Weekend
• Castle Season 2 Episode 5 – When the Bough Breaks
• Castle Season 2 Episode 4 – Fool Me Once…
• Castle Season 2 Episode 3 – Inventing the Girl
• Castle Season 2 Episode 2 – The Double Down
• Castle Season 2 Episode 1 – Deep in Death

Season 1

• Castle Season 1 Episode 10 – A Death in the Family
• Castle Season 1 Episode 9 – Little Girl Lost
• Castle Season 1 Episode 8 – Ghosts
• Castle Season 1 Episode 7 – Home Is Where the Heart Stops
• Castle Season 1 Episode 6 – Always Buy Retail
• Castle Season 1 Episode 5 – A Chill Goes Through Her Veins
• Castle Season 1 Episode 4 – Hell Hath No Fury
• Castle Season 1 Episode 3 – Hedge Fund Homeboys
• Castle Season 1 Episode 2 – Nanny McDead
• Castle Season 1 Episode 1 – Flowers for Your Grave