Guest Stars

Sure, Castle is all about investigating murders, but that doesn’t mean the cast can’t have fun while doing it!

Today, stars Stana Katic and Nathan Fillion were spotted goofing off with actor Morgan Peter Brown on the Castle set. Since Morgan tweeted several photos from the set, we think he’s probably going to have a guest role on the show sometime soon.

Brace yourselves for some relationship drama of epic proportions, Castle fans! This January, it'll be a War of the Roses-style battle for two star-crossed lovers. 

Relax, Caskett 'shippers! We're not talking about our ruggedly handsome secret lovers. We're talking about a recently divorced socialite named Samantha Voss, played by General Hospital vet Nancy Lee Grahn, who finds herself in...

Stana Katic is currently hard at work playing Detective Kate Beckett on Castle, but that doesn't mean she can't goof off from time and time.

"Standing on a corner w this guy, trying to make some $. Anyone recognize him?" Stana wrote with the above picture of her and a guest star making crazy faces on set.  

When she didn't get a ton of responses, she followed up with another, more...

We've loved Christina Applegate ever since Married … With Children and Don't Tell Mom the Babysitter's Dead, and now — more than two decades later — our fondness continues to grow.

The 40-year-old Up All Night actress recently appeared on The Tonight Show, where she gushed to Jay Leno that she gets positively "giddy" thinking about Castle and Beckett — her favorite...

Part of being a New York City cop means dealing with the most dangerous, ruthless criminals of them all — mobsters. Kate Beckett knows this all too well …

In Castle Season 5, Episode 8: "After Hours," airing on Nov. 19, the detective and her mystery writer boy toy will come face-to-face with the McElroys — a notorious crime family with ties to their victim.