• Starring: Nathan Fillion (Castle), Stana Katic (Kate), Susan Sullivan (Martha), Monet Mazur (Gina), Ruben Santiago-Hudson (Montgomery), Molly Quinn (Alexis)
• Special Guest Stars: Stephen J. Cannell (Himself), James Patterson (Himself)
• Guest Starring: Jon Huertas (Detective Javier Esposito), Seamus Dever (Detective Kevin Ryan), Dan Castellaneta (Judge Markway), Tamala Jones (Medical Examiner Lanie Parish), Keir Dullea (Jonathan Tisdale), Colby French (Cop), Brian Avers (Harrison Tisdale)
• Co-Starring: Kurt David Anderson (Kyle Cabot), Ian Jarvis (Silver Fox), Caitlin McHugh (Receptionist), Kevin Jiggetts (Uniformed Cop)
• 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: Jayne Brook (Claudia Peterson), Sarah Drew (Chloe Richardson), George Newbern (Howard Peterson), Jason Brooks (Ian Harris), Melinda Page Hamilton (Diana Harris), Ken Lerner (Police Attorney), Michael Graziadei (Brent Johnson), Len Lesser (Neighbour)
• Co-Starring: Lonyé Perrine (Bethany), Eamon Hunt (Frank Garrison), Claudia Choi (Video Technician), Rodney J. Hobbs (Worker)
• Written By: Barry Schindel
• 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: Jamie Chung (Romy Lee), Nolan Gerard Funk (Brandon), Michelle Page (Amanda), Kunal Sharma (Spencer), Steve Talley (Kent Scoville), Charlie Finn (Ian Yankman), Caitlin Dulany (Mrs. Kendall)
• Co-Starring: Creagen Dow (Max), Drew Van Acker (Donny), Patrick O'Connor (Chris Markum), David A. Kimball (Mr. Kendall), Keisuke Hoashi (Mr. Lee), Julia Nickson (Mrs. Lee), Peggy Dunne (Mrs. Heller), Anita Finlay (Margo Falcigno), Jesse D. Goins (Spencer's Lawyer)
• 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: Jonathan Banks (Bruce Kirby), Bruno Campos (Calvin Creason), Michael Reilly Burke (Frank Nesbit), Joshua LeBar (Jason Bollinger), Lisa Waltz (Laurie Horn), Alicia Ziegler (Tiffany), Amy Hathaway (Attorney)
• Co-Starring: Ron Roggé (Wolkowski), Carla Lorraine (Aide), Tim Barraco (Delivery Guy), L.T. Tolliver (Uniform)
• 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: Bill Smitrovich (Ben Davidson), Charles Malik Whitfield (Charles Wyler), Channon Roe (Kevin Henson), Peter Jason (Sheriff Sloan), Jerry Kernion (Albert Bolland), Kerrie Keane (Mrs. Davidson), Erin Matthews (Elizabeth Forte), K Callan (Delores Marsh), Phil Abrams (Roger)
• Written By: Charles Murray
• 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: Darby Stanchfield (Meredith), Aldis Hodge (Azi), Nicki Micheaux (Michelle), Michael Benyaer (Oscar), Dohn Norwood (Charles Oni)
• Co-Starring: Robert Okumu (Mukhta Baylor), Debbie Campbell (Diana Edwards), Laura Simms (Jill Button), Loren Lester (Mr. Simmons), Asia De Marcos (Yoga Manager), Kwabena Darkwah (Man)
• Written By: Gabrielle Stanton & Harry Werksman
• Directed By: Jamie Babbit

• 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: Patrick Bauchau (Caine Powell), Caterina Scorsone (Joanne Delgado), Nick Chinlund (Evan Mitchell), Joseph C. Phillips (Mayor), Katie Lowes (Rachel Maddox), Erik Van Wyck (Paul Reynolds), Elizabeth Bennett (Ruth)
• Co-Starring: Angela Oh (Anne Greene), Michael Papajohn (Karl Nadir)
• Written By: Will Beall
• Directed By: Dean White

• 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: Joanne Kelly (Lee Wax), Dan Castellaneta (Judge Markway), Joseph C. Phillips (Mayor), Alex Carter (Michael Goldman), Fred Koehler (Adam Pike), Jillian Armenante (Susan Mailer), Susan Ruttan (Mrs. Pike), Keith Diamond (Jared Swanstrom), Michael Edwin (Night Desk Clerk)
• Co-Starring: Van Epperson (Postal Clerk), Jack Forbes (Captain Sam Pike)
• 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)
• Guest Starring: Bailey Chase (FBI Agent Will Sorenson), Judy Reyes (Theresa Candela), Julian Acosta (Alfred Candela), Francis Capra (Juan Restrepo), Jeannette Sousa (Lucia Gomez), Todd Waring (Dave Ellers)
• Co-Starring: Jacqueline Torres (Nina Mendola), Melanie Lora (FBI Technician), Kurt Long (Todd), Mario Perez (Man)
• 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: Bailey Chase (Will Sorenson), Ion Overman (Candace Robinson), Robert Picardo (Clark Murray), Jackie Geary (Maggie Dowd), Robert Costanzo (Sal Tenor), Joe Marinelli (Jimmy Moran), DeLane Matthews (Jacey Goldberg), Kari Coleman (Julia Hammond), Carrie Southworth (Courtney Morantz)
• Co-Starring: Drew Osborne (Owen), Rey Herrera (Mario Guerrera), Matt Riedy (Attorney), Scott Connors (FBI Agent #1), Catherine Christensen (FBI Agent #2), Ronnie Althoff (Heavy)
• Teleplay By: Andrew W. Marlowe
• Story By: Andrew W. Marlowe & Barry Schindel
• Directed By: Bryan Spicer