Actors in both Castle and The Big Bang Theory
52 actors have appeared in both Castle and The Big Bang Theory, across 452 episodes. The most-credited is Casey Sander, Billy O'Rourke in Castle and Mike Rostenkowski in The Big Bang Theory.
| Actor | In Castle | In The Big Bang Theory | Eps | Eps |
|---|---|---|---|---|
| Casey Sander | Billy O'Rourke | Mike Rostenkowski | 1 | 6 |
| Dean Norris | Captain John Davis | Colonel Williams | 1 | 6 |
| Mark Harelik | Pete Benton | Dr. Eric Gablehauser | 1 | 5 |
| Vernée Watson | Mercy LaGrande | Althea | 1 | 5 |
| Michael Trucco | Detective Tom Demming | Dr. David Underhill | 4 | 1 |
| Valerie Azlynn | Officer Ann Hastings | Alicia | 3 | 1 |
| Dakin Matthews | David Dunne | Santa | 1 | 2 |
| Beth Behrs | Ginger | Nell | 1 | 1 |
| Jim Turner | Janacek Spivey | Reverend White | 1 | 1 |
| Jodi Lyn O'Keefe | Kristina Coterra | Mikayla | 1 | 1 |
| Julio Oscar Mechoso | Mario Sanchez | Officer Hackett | 1 | 1 |
| Michael Hyatt | Mrs. Leslie Ruiz | Charlotte | 1 | 1 |
| Summer Glau | Kendall Frost | Summer Glau | 1 | 1 |
| Tate Ellington | Henry Wright | Mitchell | 1 | 1 |
| Elena Campbell-Martinez | Mama | Maria | 1 | 2 |
| Jim Meskimen | Randolph Addison | Doctor, Man, Minister | 1 | 2 |
| Oliver Muirhead | Bryce Robert, Steven Heisler | Professor Laughlin | 2 | 1 |
| Artie O'Daly | Building Manager | Young Man | 1 | 1 |
| Eric Nenninger | John Dessens | Neil | 1 | 1 |
| Jim Holmes | Dr. Ian Fuller | Tim | 1 | 1 |
Cast data from TVmaze, licensed CC BY-SA 4.0.