The Top 10 Castle Episodes of All-Time

Castle ended this month, after eight seasons on the air, amid a swirl of controversy. The show chose not to renew Stania Katic’s contract, and plans for Season 9 included Rick Castle (Nathan Fillion) as the lead, with no Kate Beckett, despite the fact the show was based on the relationship between the characters. 

Despite all this, however it got there, the series finale contained a happily ever after.

The controversy of its ending distracted from the fact that Castle had an excellent run. The quality remained high, up until it’s last two seasons, despite the fact Castle and Beckett first got together at the end of Season 4—putting a lie to the adage that once characters get together, the show falls apart. More of my choices for top ten episodes are in Season 5 than any other season.

What really seemed to spell doom for the show, instead, was a switch in showrunners after Season 6, when creators Andrew Marlowe and Terri Miller stopped helming the show. That quality drop was clear when I began making my list, and no episodes past Season 6 made the cut—though one from Season 7 is an honorable mention.

So, here, in sequential order, are my picks for the best ten episodes of the series, with a few honorable mentions at the end. 

1.01 “Flowers for Your Grave” 

This is a perfect pilot episode, establishing Castle’s character at an book signing party and showing viewers a Beckett who’s more than a little skeptical that someone so impulsive and irreverent could also be so smart about people. “It could’ve been great,” Castle said at the end of the case. “You have no idea,” Beckett said. 

1.05 “A Chill Goes Through Her Veins”

Beckett investigates a cold case (literally) that also hits close to home, given that her mother’s murder has never been solved. It’s also an intriguing case of a corpse on ice, related to the new murder of the spouse suspected to have killed her. This episode is notable for two elements: 

  1. Though the pair catch the killer, they never get a confession.
  2. It’s the first time Beckett goes to Castle for help with a case. 

2.04 “Fool Me Once…”

A con man is murdered, and nothing is at it seems. This may be the episode with the finest Castle/Beckett banter, as they toss names of con games back and forth, each trying to top the other. They’re both needed to solve the case and catch the real killer. 

2.19 “Wrapped Up in Death”

A museum curator is murdered, a mummy is missing, a museum director is thrilled with the publicity, and Beckett name checks the Scooby gang. Also, Castle is cursed, leading to much amusement. It all ends with Beckett saying Scooby’s signature “ruh-roh” and Castle’s curse being lifted. May be the most fun episode of all.

3.11 “Last Call” 

A case that makes great use of New York City’s past, from the tales of Prohibition Era Mayor Jimmy Walker to the bar, the Old Haunt—a haven for writers—to the hidden tunnels that run all over New York City. Yes, there’s even a little Billy Joel at the end. 

4.22 “Undead Again” 

A zombie episode? Of course that’s going to be in the top ten, especially when Fillion is having so much fun investigating the case. He’s at his most charming, the zombie case is solid, and Castle makes a fateful decision about sticking with Beckett until she realizes she loves him. 

5.01 “After the Storm”

The only “mythology” episode to make it to this list. The serious episodes of Castle weren’t its strength, and the long-running saga to solve the murder of Beckett’s mother took some unbelievable twists and turns. But this episode, featuring the lovely and sexy morning-after-sex sequence, complete with banter and physical comedy—plus Kate’s choice to stay on the right side of the law—make it worthy of the top ten. “You were right, I had no idea,” Castle says after the sex, echoing Kate’s words from the pilot. 

5.06 “The Final Frontier” 

Castle and Beckett solve a murder at a comic con that took place inside a simulation of a pretend science fiction television show. Many in-jokes about Fillion’s past on Firefly (aka “that Joss Whedon” show), fun times with cosplayers, plus Beckett’s speech about how a cheesy show and its characters can inspire people in real life. “Don’t make fun, Castle,” she says. Never. Well, except for that William Shatner narration at the end, which is endlessly amusing.

5.09 “Lives of Others”

Castle is stuck at home, bored and in a wheelchair, after a skiing accident. He quickly channels Jimmy Stewart in Rear Window and witnesses what he thinks is a murder in the apartment building across the street. Meanwhile, Beckett has a murder on video that provides an alibi for her main suspect. Neither crime is what it seems. This was the show’s 100th episode. 

6.05 “Time Will Tell”

Season 6 had a number of strong episodes, including a crime-solving honeymoon in an Old West town, the birth of Jenny and Ryan’s daughter, and the final arrest of Bracken—but I tend to favor the light-hearted episodes, and this one features a Terminator-like case, in which the suspect claims to be a Kyle Reese-type sent back to save an important person’s life. He also tells Beckett that she’ll be a senator, she and Castle will have four kids, and he’ll start writing a serious book. Then, the time traveler disappears at the end. Was he real? You decide.

Honorable mentions: 

  • 2.11 “Fifth Bullet”: Amnesia, art and true love combine in a twisty plot. 
  • 2.16 “The Mistress Always Spanks Twice”: The investigation of a dominatrix serves as the basis for Castle and Beckett to banter. 
  • 3.03 “Under the Gun”: Beckett’s former training partner, Royce, appears to solve a mystery, but disappoints her. This is partially on my list for Jason Beghe, partially because, like Castle, I love a treasure map. 
  • 3.04 “Punked”: Steampunk is the star of this mystery concerning a 200-year-old bullet. Castle again gets to have fun with outlandish theories.
  • 3.11 “Nikki Heat”: Guest-star Laura Prepon as the title character provides two Becketts for the price of one. But Castle only wants one in his bed.
  • 4.02 “Heroes and Villains”: The gang investigates a literal superhero who may have chopped up a bad guy. Many superhero inside jokes follow. 
  • 5.09 “Secret Santa”: Castle gets all the best lines after a Santa falls out of the sky. 
  • 6.11 “Under Fire”: Esposito and Ryan are trapped in a burning building during an arson investigation, while Ryan’s wife Jenny gives birth to their daughter. 
  • 6.22 “Veritas”: Beckett and Castle finally arrest the man who killed Beckett’s mother.
  • 7.07 “Once Upon a Time in the West”: A treasure hunt and an Old West town provide a working honeymoon. Fillion gets all the best lines. 


Corrina Lawson is a writer, mom, geek and superhero, though not always all four on the same day. She is a senior editor of the GeekMom blog at Wired and the author of a superhero romance series and an alternate history series featuring Romans and Vikings in ancient North America. She has been a comic book geek all her life and often dreamed of growing up to be Lois Lane.

Read all posts by Corrina Lawson for Criminal Element.


  1. Katy

    “Undead Again” might possibly be my favorite episode of all, partly for the guy screaming for them to shoot him, and partly for “Killer’s a zombie!”

    Though I love the beginning of “The Final Frontier,” when Jonathan Frakes asks for Castle’s autograph, and Castle mutters something about how the mighty have fallen. (Frakes directed the episode.)

    And the episode with Castle’s ‘epic’ Halloween party, in which he plans on going as (basically) Mal from Firefly and Alexis says space cowboys are a no-go, and then at the party, Ryan is dressed in scrubs (referencing the actor’s stint on a soap as a doctor) and Esposito in desert camo, a reference to “Generation Kill.”

    So many lovely moments, on a show that should have bowed out at the end of season 6…

    • Kate

      😮 😮 😮 it should definitely not have ended at season 6! The show is awesome!!

  2. s. little

    Except in the last one you posted, the time traveler says they’ll have 3 children. I tend to like the serious ones, like with 3XK, the one where Montgomery is killed, the one arresting Bracken, love their interaction together, but I do love the comedic ones as well. Heck, I just love them all lol

  3. Merrily Boone

    A agree on most of your choices. Season 5 was my favorite, too. I’d add Murder He Wrote 5.4, Target 5-15, and Heat 5-16. I’m a little confused because you say both Secret Santa and Lives of Others are 5.09. Did you mean Signigicant Others (5.10)?
    Thanks for a great article.
    Merrily Boone

    • Kate

      Merrily, I like Murder He Wrote too and I definitely think it should have gotten at least an honourable mention.

  4. Gary

    Just rewatched Hollander’s Woods. I would think that would be up there. Ties in such an important part of Castle’s life and what made him a writer. Good philosophical conversation with Becket on paths that led them to each other.

  5. Beth

    Oh come on … no one else thinks of the Double Down as the best?? I do agree with you on one thing … love them all! Miss them.

  6. Kate

    Dude. Most of these episodes, I don’t even like, or I think they’re just “meh.” In my opinion, the all time best ever Castle episode is “Always”, S4 E23. It didn’t even get an honourable mention! Also, other ones that I think should be in the top 10 are Countdown, Setup, Knockout, Rise, and Murder He Wrote. What do y’all think?

  7. susan4stars

    I’m watching Castle for the first time, in order, and just finished the two part terrorism episodes in Season 3–Setup and Countdown. Fantastic episodes! I could not take my eyes off the screen. Action, near-death, twists, bittersweet romance, all wonderfully intermixed. So, since we have similar tastes, I’m looking forward to the upcoming episodes you mentioned, especially Always in Season 4.

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