|Under the Gun|
|Season 3, Episode 3|
|Air date||October 4, 2010|
|Written by||Alexi Hawley|
|Directed by||Bryan Spicer|
With the latest case of a murdered bail bondsman, Beckett discovers that Castle's wild imagination and theories may be on the mark. Beckett's ex-partner makes a surprise arrival and Castle is forced to watch the two reminisce and engage in a little romance.
- Nathan Fillion as Richard Castle
- Stana Katic as Detective Kate Beckett
- Jon Huertas as Detective Javier Esposito
- Seamus Dever as Detective Kevin Ryan
- Tamala Jones as Dr. Lanie Parish
- Ruben Santiago-Hudson as Captain Roy Montgomery (credit only)
- Molly Quinn as Alexis Castle
- Susan Sullivan as Martha Rodgers
- Jason Beghe as Mike Royce
- Keith Robinson as Random Pierce
- Sophina Brown as Brooke Carver
- James Handy as Clifford Stuckey
- Brian Krause as Father Aaron Low
- Unknown actor as Deon Carver
- Beckett: Well, bikes are what girls want when we realize that we’re never going to get a pony.
- Castle: Did you have one?
- Beckett: I still do. ’94 Harley soft tail. Worked all of high school to pay for it.
- "Healing Hands" - Citizen Cope
- It's revealed in this episode that Beckett, when she was in High School worked through school to buy herself a 94 Harley Davidson Softail which she still has today.
- Castle's mention of being "really close" with his CIA conspiracy hypothesis is a reference to "A Deadly Game".