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Castle

Watch Castle Season 3 full episodes online, free and paid options via our partners and affiliates.

Castle Season Finale Pic
Watch Castle Season 3 Episode 24
"Knockout"
Original Air Date:

Beckett learns key intel regarding her mother's murder on this episode. Read on for a recap of the season finale.

Pretty Dead Picture
Watch Castle Season 3 Episode 23
"Pretty Dead"
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During a rehearsal for "Baron's All-American Beauty Pageant," the contestants find the dead body of Miss Illinois! Castle and Beckett must dive into the world of cut-throat beauty contest competitions.

Castle and Beckett Image
Watch Castle Season 3 Episode 22
"To Love and Die in L.A."
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Her ex-partner's death leads Beckett to Los Angeles on this episode of Castle.

Kick Pic
Watch Castle Season 3 Episode 21
"The Dead Pool"
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When a champion swimmer is found dead in a training pool, Castle & Beckett dive in to investigate his murder, and uncover myriad secrets.

Slice of Death Scene
Watch Castle Season 3 Episode 20
"Slice of Death"
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A reporter is found dead this week, in a most unusual way: inside a pizza over. Beckett and Castle investigate.

Poisoned Juror
Watch Castle Season 3 Episode 19
"Law & Murder"
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A juror died during a high profile case this week. Turns out, the individual was poisoned. Get on that case, Castle and Beckett!

Soap Opera Set
Watch Castle Season 3 Episode 18
"One Life to Lose"
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Castle takes on the world of soap operas this week. A number of stars from actual daytime dramas stop by for cameos.

Racing Against Time
Watch Castle Season 3 Episode 17
"Countdown"
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Time is running out for Castle and Beckett this week. They must put aside any differences with Agent Fallon and, simply put, save the city.

Adrian Pasdar on Castle
Watch Castle Season 3 Episode 16
"Setup"
Original Air Date:

Adrian Pasdar debuts on Castle this week, playing a federal agent. He's brought in to take over the investigation of a massive conspiracy.

Old Files
Watch Castle Season 3 Episode 15
"The Final Nail"
Original Air Date:

Jason Wiles guest stars this week as a former friend of Castle's... and the main suspect in a case. This places Castle and Beckett on opposite sides of the investigation.

Crime Scene Pondering
Watch Castle Season 3 Episode 14
"Lucky Stiff"
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A lottery winner is killed in brutal fashion this week, resulting in a number of suspects. In related news, Martha inherits money she thinks she doesn't deserve.

Startled Duo
Watch Castle Season 3 Episode 13
"Knockdown"
Original Air Date:

The lead detective on Beckett's mom's murder cases resurfaces this week. A subsequent investigation leads back to a decades-old conspiracy.

Gilles Marini on Castle
Watch Castle Season 3 Episode 12
"Poof! You're Dead"
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Carrie Genzel guest stars on this episode of Castle. She portrays a former model and the wife of a billionaire. Gilles Marini also plays a key role.

Rick and Natalie Rhodes
Watch Castle Season 3 Episode 11
"Nikki Heat"
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Laura Prepon shows up on this special episode of Castle. It focuses on Castle's book and the actress that will help bring it to the big screen.

Last Call Scene
Watch Castle Season 3 Episode 10
"Last Call"
Original Air Date:

A body is found floating in the East River on this episode, which leads Castle and Beckett into old tunnels and passageways of New York City. Once there, the partners find a secret from the days of Prohibition.

A Matter of Abduction?
Watch Castle Season 3 Episode 9
"Close Encounters of the Murderous Kind"
Original Air Date:

An astrophysicist is found dead this week, leading to a case that keeps pointing back to the impossible: alien abduction. Lyle Lovett guest stars.

A Fowl Murder
Watch Castle Season 3 Episode 8
"Murder Most Fowl"
Original Air Date:

A subway worker is found dead shot to death this week. While working this case, Castle and Beckett uncover the violet abduction of a young boy and must unravel the motives behind this kidnapping.

Beckett at Work
Watch Castle Season 3 Episode 7
"Almost Famous"
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Beckett and Castle respond to an "officer down" call this week and are in for a surprise: the victim is actually a male stripper dressed as a cop. Hot stuff!

After the Tripler Killer
Watch Castle Season 3 Episode 6
"3XK"
Original Air Date:

Is the Tripler Killer back after a four year hiatus? It seems that way this week, as Castle and Beckett play a dangerous game of wits with the murderer.

Gina
Watch Castle Season 3 Episode 5
"Anatomy of a Murder"
Original Air Date:

Pallbearers lose control of a casket this week, causing an extra body to somehow tumble out. Rick and Castle must then look into the murder of a doctor, while Gina bonds with Alexis.

Confused Investigators
Watch Castle Season 3 Episode 4
"Punked"
Original Air Date:

Castle and Beckett look into the murder of a young mathematician this week. He was murdered with a 200-year-old bullet, which leads to thoughts of a time-traveling culprit.

Graveyard Shooting
Watch Castle Season 3 Episode 3
"Under the Gun"
Original Air Date:

Might Castle's unusual theory pan out this week? Beckett must consider the possibility. Elsewhere, her former partner returns. Might things turn romantic?

A Beckett Smile
Watch Castle Season 3 Episode 2
"He's Dead, She's Dead"
Original Air Date:

Our favorite duo investigates the murderer of a well-known psychic this week, while also debating whether extrasensory abilities are valid or not. A written letter also plays a key role.

Season 3 Premiere Scene
Watch Castle Season 3 Episode 1
"A Deadly Affair"
Original Air Date:

Castle as a murder suspect?!? That's how season three kicks off, as Beckett starts the episode having not seen her partner in awhile, only to later arrest the author.