Actors in both CSI: Crime Scene Investigation and The X-Files
226 actors have appeared in both CSI: Crime Scene Investigation and The X-Files, across 555 episodes. The most-credited is Mitch Pileggi, Happy Harry Desmond in CSI: Crime Scene Investigation and Assistant Director Walter Skinner in The X-Files.
| Actor | In CSI: Crime Scene Investigation | In The X-Files | Eps | Eps |
|---|---|---|---|---|
| Mitch Pileggi | Happy Harry Desmond | Assistant Director Walter Skinner | 1 | 70 |
| Alex Carter | Detective Vartann | Chief Strong | 39 | 1 |
| Nicholas Lea | Chris Bezich | Agent Alex Krycek, Michael | 4 | 25 |
| Annabeth Gish | Laura Gabriel | Special Agent Monica Reyes | 3 | 7 |
| Scott Wilson | Sam Braun | Reverend Orison | 8 | 1 |
| Cary Elwes | Police Officer | Assistant Director Brad Follmer | 1 | 6 |
| Xander Berkeley | Sheriff Rory Atwater | Dr. Hodge | 5 | 1 |
| Doug Hutchison | Dalton Betton, Nigel Crane | Eugene Victor Tooms | 3 | 2 |
| Conor O'Farrell | Undersheriff McKeen | Sheriff Ciolino | 13 | 1 |
| Glenn Morshower | Sheriff Brian Mobley | Aaron Starkey | 7 | 1 |
| Nick Chinlund | Gus Davis, Mickey Rutledge | Donald Eddie Pfaster | 2 | 2 |
| Titus Welliver | Mark Gabriel | Doug Spinney | 3 | 1 |
| Judith Scott | Dr. Jenna Williams | Dr. Kai Bowe | 6 | 1 |
| Raymond J. Barry | Arvin Thorpe, Philip Gerard | Senator Richard Matheson | 4 | 3 |
| Arye Gross | Paul Winston, Vincent DeMarcus | Dr. Puvogel | 2 | 1 |
| Brent Sexton | Mark Doyle | Gravedigger, Steven Melnick | 1 | 2 |
| Eric Nenninger | Jesse, Officer Collins | Jared Chirp | 2 | 1 |
| Jack McGee | Richard O'Malley, Road manager | Bob Damphouse | 2 | 1 |
| Lindsey Ginter | Mr. Daniels | Crew-Cut Man | 1 | 2 |
| Mark Pellegrino | Bruno Curtis, Elliot Perolta | Derwood Spinks | 2 | 1 |
Cast data from TVmaze, licensed CC BY-SA 4.0.