• Starring: Nathan Fillion (Castle), Stana Katic (Kate), Susan Sullivan (Martha), Ruben Santiago-Hudson (Montgomery), Molly Quinn (Alexis), Jon Huertas (Esposito), Tamala Jones (Lanie), Seamus Dever (Ryan)
• Special Guest Stars: Stephen J. Cannell (Himself), Michael Connelly (Himself)
• Guest Starring: Elizabeth Ho (Amy Saunders), Laurel Holloman (Sandy Allen), David Bowe (Max Haverstock), Robert Gant (Ron Bigby), David Meunier (Sasha)
• Co-Starring: Jonathan T. Floyd (Luther), Luis Moncada (Jesus), Bill Tangradi (Hank), Adam J. Smith (Tom Moroni), Peter Randolf (Photographer), Dmitri Boudrine (Ilya), Michael Petrone (Ivan), Stefan Ionesco (Serge)
• Written By: Andrew W. Marlowe
• Directed By: Rob Bowman

• Starring: Nathan Fillion (Castle), Stana Katic (Kate), Susan Sullivan (Martha), Ruben Santiago-Hudson (Montgomery), Molly Quinn (Alexis), Jon Huertas (Esposito), Tamala Jones (Lanie), Seamus Dever (Ryan)
• Guest Starring: Diana Maria Riva (Detective Roselyn Karpowski), Arye Gross (Medical Examiner Perlmutter), Brennan Elliott (Jason Cosway), Matt Winston (Evan Hinkle), Gareth Williams (Wesley Grovner), Amy Stewart (Brandy Rossi), Jim O'Heir (Hal Ross), Linara Washington (Christina Marx)
• Co-Starring: Marco Martinez (Eric Marx), Dinora Walcott (Detective Mindy Stegner), Brian Allen (Messianic Looking Guy)
• Written By: David Grae
• Directed By: Rob Bowman

• Starring: Nathan Fillion (Castle), Stana Katic (Kate), Susan Sullivan (Martha), Ruben Santiago-Hudson (Montgomery), Molly Quinn (Alexis), Jon Huertas (Esposito), Tamala Jones (Lanie), Seamus Dever (Ryan)
• Guest Starring: Jeffrey Pierce (Wyatt Monroe), Matt Barr (Travis McBoyd), Torrey DeVitto (Sierra Goodwin), Shanna Collins (Rina), Julian Sands (Teddy Farrow), Jon Fleming (Will James)
• Co-Starring: Jason E. Kelley (Event Organizer), Candice K. Patton (Young Woman), Paul Diaz (Young Man)
• Written By: Moira Kirland
• Directed By: Dwight Little

• Starring: Nathan Fillion (Castle), Stana Katic (Kate), Susan Sullivan (Martha), Ruben Santiago-Hudson (Montgomery), Molly Quinn (Alexis), Jon Huertas (Esposito), Tamala Jones (Lanie), Seamus Dever (Ryan)
• Guest Starring: Kathleen Rose Perkins (Elise Finnegan), David Ramsey (Jim Wheeler), Robert Pine (Gerry Finnegan), Tyler Hoechlin (Dylan Fulton), Stephanie Faracy (Patty Schultz), Chet Grissom (Agent Gray)
• Co-Starring: Jennifer Riker (Sue Vaughn), Ilene Graff (Gayle Finnegan), Will Beinbrink (Steven Fletcher), Frank Gallegos (Kurt Lopez), Kahlil Joseph (Bank Manager)
• Written By: Alexi Hawley
• Directed By: Bryan Spicer

• Starring: Nathan Fillion (Castle), Stana Katic (Kate), Susan Sullivan (Martha), Ruben Santiago-Hudson (Montgomery), Molly Quinn (Alexis), Jon Huertas (Esposito), Tamala Jones (Lanie), Seamus Dever (Ryan)
• Guest Starring: Reed Diamond (Dr.Cameron Talbot), Diana Maria Riva (Detective Roselyn Karpowski), Arye Gross (Medical Examiner Perlmutter), Elaine Hendrix (Melissa Talbot), Ivo Nandi (Teodor Hajek), Jeff Doucette (Super), Timi Prulhiere (Talbot's Nurse)
• And: Debi Mazar (Paula Haas)
• Co-Starring: Griffin Cleveland (Zane Talbot), Francisco Viana (Manager), John Brantley Cole (NYPD Uniform)
• Written By: René Echevarría
• Directed By: John Terlesky

• Starring: Nathan Fillion (Castle), Stana Katic (Kate), Susan Sullivan (Martha), Ruben Santiago-Hudson (Montgomery), Molly Quinn (Alexis), Jon Huertas (Esposito), Tamala Jones (Lanie), Seamus Dever (Ryan)
• Guest Starring: Anita Barone (Janice Freeman), Robin Thomas (Alan Freeman), Samantha Shelton (Vixen), Phil LaMarr (Dr. Holloway), Amy Hill (Alma), Jim Gleason (Dr. Barry Frank)
• Co-Starring: Rob Arbogast (Morlock), Erin Sanders (Rosie Freeman), Glenn Taranto (Douglas Lawson), Emily Bicks (Paige)
• Written By: Terri Edda Miller
• Directed By: Karen Gaviola

• Starring: Nathan Fillion (Castle), Stana Katic (Kate), Susan Sullivan (Martha), Ruben Santiago-Hudson (Montgomery), Molly Quinn (Alexis), Jon Huertas (Esposito), Tamala Jones (Lanie), Seamus Dever (Ryan)
• Guest Starring: Anne Ramsay (Bree Busch), Arye Gross (Medical Examiner Perlmutter), Robert Curtis Brown (Ian Busch), Erin Foster (Sky Blue), Clayton Rohner (John McGinnis), Jesse John Head (Zack Metzger)
• Co-Starring: Bernardo De Paula (Franco Marquez), Brianna Haynes (Hayley Blue), Rashawn Underdue (Tony)
• Written By: Jose Molina
• Directed By: Rob Bowman

• Starring: Nathan Fillion (Castle), Stana Katic (Kate), Susan Sullivan (Martha), Ruben Santiago-Hudson (Montgomery), Molly Quinn (Alexis), Jon Huertas (Esposito), Tamala Jones (Lanie), Seamus Dever (Ryan)
• Guest Starring: Gregg Henry (Winston Wellesley), Mark Moses (Blake Wellesley), Arye Gross (Medical Examiner Perlmutter), Hattie Winston (Sally Niedermeyer), Ron Melendez (Jeff Dilahunt), Jill Andre (Lenanne Wellesley), Josh Daugherty (Trent Wellesley), Sonya Leslie (Valerie Thompson), Judy Kain (Sara)
• Co-Starring: Jeff Harlan (Frank Davis), Taneka Johnson (Edwina), Rod Damer (Bartender)
• Written By: Terence Paul Winter
• Directed By: Jonathan Frakes

• Starring: Nathan Fillion (Castle), Stana Katic (Kate), Susan Sullivan (Martha), Ruben Santiago-Hudson (Montgomery), Molly Quinn (Alexis), Jon Huertas (Esposito), Tamala Jones (Lanie), Seamus Dever (Ryan)
• Guest Starring: Michaela McManus (Scarlett Price), J.B. Smoove (Norman Jessup), Jonathan LaPaglia (John Knox), Danny Nucci (Gilbert Mazzara), Charles Rahi Chun (Paul Cho)
• Co-Starring: Shari Headley (Nicole Cameron), Ray Laska (Dan Tonelli), Christian R. Conrad (Husband), Nancy Young (Wife)
• Written By: Alexi Hawley
• Directed By: Bryan Spicer

• Starring: Nathan Fillion (Castle), Stana Katic (Kate), Susan Sullivan (Martha), Ruben Santiago-Hudson (Montgomery), Molly Quinn (Alexis), Jon Huertas (Esposito), Tamala Jones (Lanie), Seamus Dever (Ryan)
• Guest Starring: Abigail Spencer (Sarah Reid), Perrey Reeves (Helen Parker), DB Woodside (Lance Carlberg), Alex Skuby (Charlie DePetro), Matt Champagne (Andy Berman)
• Co-Starring: Nick Jaine (Forensic IT Guy), Link Baker (Officer), David Appelbaum (Clerk), Ana Ayora (Young Woman)
• Written By: Elizabeth Davis
• Directed By: Helen Shaver

• Starring: Nathan Fillion (Castle), Stana Katic (Kate), Susan Sullivan (Martha), Ruben Santiago-Hudson (Montgomery), Molly Quinn (Alexis), Jon Huertas (Esposito), Tamala Jones (Lanie), Seamus Dever (Ryan)
• Guest Starring: Marc Blucas (Jeremy Preswick), Anne Dudek (Emma Carnes), Carlo Rota (Bahir Harun), J.P. Pitoc (Darius Langley), Phil LaMarr (Dr. Holloway), Marisa Ramirez (Angelica Fink), Dahlia Salem (Tory Westchester), Rider Strong (Rocco Jones)
• Co-Starring: Eltony Williams (Officer Marino), Desiree Taylor (Attendant), Courtney Geigle (Driver)
• Written By: David Grae
• Directed By: John Terlesky

• Starring: Nathan Fillion (Castle), Stana Katic (Kate), Susan Sullivan (Martha), Ruben Santiago-Hudson (Montgomery), Molly Quinn (Alexis), Jon Huertas (Esposito), Tamala Jones (Lanie), Seamus Dever (Ryan)
• Guest Starring: Brady Smith (Greg Murphy), Graham Beckel (Uncle Teddy), Ryan Alosio (Mike Weitz), Mimi Kuzyk (Sheila Blaine), Joe Nieves (Boyd Gamble)
• And: Alyssa Milano (Kyra Blaine)
• Co-Starring: Deborah Strang (Ruby), Peter Katona (Keith Murphy), Gina Hiraizumi (Laurie Hill), Kimberly Estrada (Lisa Bloomfield), Brian Patrick Mulligan (Justice of the Peace), Kevin Herrera (Waiter)
• Teleplay By: Terri Edda Miller & Terence Paul Winter
• Story By: Alexi Hawley
• Directed By: Bryan Spicer

• Starring: Nathan Fillion (Castle), Stana Katic (Kate), Susan Sullivan (Martha), Ruben Santiago-Hudson (Montgomery), Molly Quinn (Alexis), Jon Huertas (Esposito), Tamala Jones (Lanie), Seamus Dever (Ryan)
• Guest Starring: Jay R. Ferguson (Dick Coonan), Eddie Shin (Johnny Vong), James Cosmo (Finn Rourke), Scott Paulin (Jim Beckett), Robert Picardo (Dr. Clark Murray), Danny Nucci (Gilbert Mazzara), Patrick St. Esprit (Special Agent Forrest)
• Co-Starring: Jenna Leigh Green (Molly), John Brantley Cole (Officer Clayton Lee), Mark Adair-Rios (Trucho), Bernard K. Addison (Attorney), Glenn Keogh (Tommy), Tom Morga (Tall Guy)
• Written By: Will Beall
• Directed By: Thomas J. Wright

• Starring: Nathan Fillion (Castle), Stana Katic (Kate), Susan Sullivan (Martha), Ruben Santiago-Hudson (Montgomery), Molly Quinn (Alexis), Jon Huertas (Esposito), Tamala Jones (Lanie), Seamus Dever (Ryan)
• Guest Starring: Rick Gonzalez (Mickey Carlson), Sarah Brown (Amanda Livingston), Scott Elrod (Clyde Dekker), Senta Moses (Michele Langford), Jack McGee (Dale Fickas), Siena Goines (Donna Vincennes), Christie Lynn Smith (Melanie Kopek), Jon Curry (Stan Kopek)
• Co-Starring: Michael Enright (Noel Du Preez), Corey Mendell Parker (Reggie Dyson), Shania Accius (Candace Dyson), David Appelbaum (Morgue Attendant), Kortney Nash (Simone Dyson), Yurie Ann Cho (Hostess), Adrian Neil (Maitre D')
• Written By: Terence Paul Winter
• Directed By: Rosemary Rodriguez

• Starring: Nathan Fillion (Castle), Stana Katic (Kate), Susan Sullivan (Martha), Ruben Santiago-Hudson (Montgomery), Molly Quinn (Alexis), Jon Huertas (Esposito), Tamala Jones (Lanie), Seamus Dever (Ryan)
• Guest Starring: Ray Wise (Bobby Fox), Arye Gross (Medical Examiner Perlmutter), Don Franklin (Tommy Zane), Chandra West (Maggie Vega), Julio Oscar Mechoso (Mario Sanchez), José Zúñiga (Alfredo Quintana), Vanessa Martinez (Lara Blanco), Dayo Ade (Anton Wade), Rebeka Montoya (Ana Rivera)
• And: Joe Torre (Himself)
• Co-Starring: Nina Rausch (Receptionist)
• Written By: Jose Molina
• Directed By: David M. Barrett

• Starring: Nathan Fillion (Castle), Stana Katic (Kate), Susan Sullivan (Martha), Ruben Santiago-Hudson (Montgomery), Molly Quinn (Alexis), Jon Huertas (Esposito), Tamala Jones (Lanie), Seamus Dever (Ryan)
• Guest Starring: Amy Gumenick (Danielle), Devon Gummersall (Matt Haley), Dina Meyer (Lady Irena), Keiko Agena (Kelly), Tom Schanley (William Carraway), Gil McKinney (Tyler Benton), Azita Ghanizada (Mistress Sapphire), Juliana Dever (Jenny), Paul Schackman (Barry), Mark Damon Espinoza (Professor Stevenson)
• Co-Starring: Angel Parker (Receptionist)
• Written By: Kate Sargeant
• Directed By: Thomas J. Wright

• Starring: Nathan Fillion (Castle), Stana Katic (Kate), Susan Sullivan (Martha), Ruben Santiago-Hudson (Montgomery), Molly Quinn (Alexis), Jon Huertas (Esposito), Tamala Jones (Lanie), Seamus Dever (Ryan)
• Special Guest Star: Dana Delany (Federal Agent Jordan Shaw)
• Guest Starring: Leonard Roberts (Jason Avery), Andrew Rothenberg (Donald Salt)
• Written By: Moira Kirland
• Directed By: Bryan Spicer

• Starring: Nathan Fillion (Castle), Stana Katic (Kate), Susan Sullivan (Martha), Ruben Santiago-Hudson (Montgomery), Molly Quinn (Alexis), Jon Huertas (Esposito), Tamala Jones (Lanie), Seamus Dever (Ryan)
• Special Guest Star: Dana Delany (Federal Agent Jordan Shaw)
• Guest Starring: Leonard Roberts (Jason Avery), Dameon Clarke (Scott Dunn), Mary-Pat Green (Erin Murphy)
• Co-Starring: Isaiah Mustafa (Team Leader)
• Written By: Elizabeth Davis
• Directed By: John Terlesky

• Starring: Nathan Fillion (Castle), Stana Katic (Kate), Susan Sullivan (Martha), Ruben Santiago-Hudson (Montgomery), Molly Quinn (Alexis), Jon Huertas (Esposito), Tamala Jones (Lanie), Seamus Dever (Ryan)
• Guest Starring: Currie Graham (Stanford Oakes), Navi Rawat (Rachel Walters), Erick Avari (Austin Bentley), Gil Birmingham (Chaac Te), Steve Cell (Charles Taylor), Al Vicente (Norton Grimes)
• Co-Starring: Kevin Foster (Will Medina), Omid Zader (Cab Driver)
• Written By: Alexi Hawley
• Directed By: Bill Roe

• Starring: Nathan Fillion (Castle), Stana Katic (Kate), Susan Sullivan (Martha), Ruben Santiago-Hudson (Montgomery), Molly Quinn (Alexis), Jon Huertas (Esposito), Tamala Jones (Lanie), Seamus Dever (Ryan)
• Guest Starring: Tom Bergeron (Bobby Mann), Kelly Carlson (Ellie Monroe), Bill Bellamy (Mickey Reed), Amy Aquino (Janine Marks), Dan Cortese (Howard Weisberg), French Stewart (Zach Robinson), Nicholle Tom (Cindy Mann), Beth Broderick (Barbara Mann), Sydney Walsh (Patty DeLuca), Nika Williams (Angel Santana)
• And: Fred Willard (Hank McPhee)
• Co-Starring: Michael Cummings (Burt), Brittany Belt (Kayla)
• Written By: David Grae
• Directed By: Bryan Spicer

• Starring: Nathan Fillion (Castle), Stana Katic (Kate), Susan Sullivan (Martha), Ruben Santiago-Hudson (Montgomery), Molly Quinn (Alexis), Jon Huertas (Esposito), Tamala Jones (Lanie), Seamus Dever (Ryan)
• Guest Starring: Scott Cohen (Lieutenant Stan Holliwell), Michael Ironside (Victor Racine), Abby Brammell (Carol Thornton), Merrin Dungey (Monica Finch), Aaron D. Spears (Ike Thornton), Bruno Amato (Fred Cana)
• And: Michael Trucco (Tom Demming)
• Co-Starring: Marcus Scribner (Tim Thornton)
• Written By: Will Beall
• Directed By: John Terlesky

• Starring: Nathan Fillion (Castle), Stana Katic (Kate), Susan Sullivan (Martha), Ruben Santiago-Hudson (Montgomery), Molly Quinn (Alexis), Jon Huertas (Esposito), Tamala Jones (Lanie), Seamus Dever (Ryan)
• Guest Starring: Julie Gonzalo (Madison), Arye Gross (Perlmutter), Suzy Nakamura (Jennifer Wong), Max Greenfield (David Nicolaides), Erin Cahill (Cecily), Richard Gleason (Wesley Slade), Rocco DiSpirito (Himself), Allison Dunbar (Sandra Meyers), Benny Nieves (Domingo Verdugo)
• And: Michael Trucco (Tom Demming)
• Co-Starring: Ryan Daniel Dobson (Balthazar Wolf), Colin Kim (Spike), Ronnie Alvarez (Juan)
• Written By: Terri Edda Miller
• Directed By: Ron Underwood

• Starring: Nathan Fillion (Castle), Stana Katic (Kate), Susan Sullivan (Martha), Ruben Santiago-Hudson (Montgomery), Molly Quinn (Alexis), Jon Huertas (Esposito), Tamala Jones (Lanie), Seamus Dever (Ryan)
• Guest Starring: Julie Claire (Lisa Jenkins), William R. Moses (Blake Wilder), Jennifer Hall (Rebecca Strong), Kasey Mahaffy (Lance Newman), Ella Thomas (Natasha Piper), Stephen Full (Benny), Paul Carafotes (Lukas Canby), Jim Hoffmaster (Clerk)
• And: Michael Trucco (Tom Demming)
• Co-Starring: Melanie Laenani Lewis (Daphne), Monica Garcia (Cleaning Lady)
• Written By: René Echevarría
• Directed By: John Terlesky

• Starring: Nathan Fillion (Castle), Stana Katic (Kate), Susan Sullivan (Martha), Ruben Santiago-Hudson (Montgomery), Molly Quinn (Alexis), Jon Huertas (Esposito), Tamala Jones (Lanie), Seamus Dever (Ryan)
• Special Guest Stars: Stephen J. Cannell (Himself), Michael Connelly (Himself), James Patterson (Himself)
• Guest Starring: Monet Mazur (Gina), Mitch Pileggi (Hans Brauer), Allison McAtee (Andrea Fisher), Rick Worthy (Jason Penn), Melissa De Sousa (Liz Penn), Ian Reed Kesler (Hugo Morrison), David Starzyk (Lee Copley), David Kelsey (Ken Fisher), Lucia Sullivan (Melinda Farraday)
• And: Michael Trucco (Tom Demming)
• Co-Starring: Dean Cates (Roger Farraday), Cristina Ainoa (Operator)
• Written By: Andrew W. Marlowe
• Directed By: Rob Bowman