Actors in both Stargate SG·1 and The X-Files
236 actors have appeared in both Stargate SG·1 and The X-Files, across 431 episodes. The most-credited is Teryl Rothery, Dr. Janet Fraiser, Heimdall in Stargate SG·1 and Nurse Michelle Charters in The X-Files.
| Actor | In Stargate SG·1 | In The X-Files | Eps | Eps |
|---|---|---|---|---|
| Teryl Rothery | Dr. Janet Fraiser, Heimdall | Nurse Michelle Charters | 75 | 1 |
| William B. Davis | Prior Damaris | Cigarette-Smoking Man | 2 | 44 |
| Dan Shea | Sgt. Sylvester Siler, MSgt. Sylvester Siler, Fire Fighter | Deputy | 60 | 1 |
| Bill Dow | Dr. Bill Lee | Dr. Charles Burks, Dad, Dr. Rick Newton | 20 | 9 |
| Tony Amendola | Master Bra'tac | Cigarette Smoking Pontiff | 26 | 1 |
| Peter Williams | Apophis | Jackson | 20 | 1 |
| Eric Breker | Albert Reynolds | Dark-Suited Man #1, Admitting Officer, SP Agent Brem | 16 | 4 |
| Bruce Harwood | Dr. Osbourne | John Fitzgerald Byers | 1 | 38 |
| Colin Cunningham | Major Paul Davis | Dr. Henry Stroman, Escalante, Lt. Terry Wilmer | 15 | 3 |
| Chris Owens | Armin Selig | Special Agent Jeffrey Spender, Young Cigarette-Smoking Man, Mutato | 1 | 15 |
| Steven Williams | Lt. Gen. Maurice Vidrine | Mr. X | 3 | 13 |
| Tom McBeath | Col. Harry Maybourne | Detective Gwynn, Dr. Lewton, Scientist | 11 | 3 |
| Brendan Beiser | Weaver | Agent Sean Pendrell | 1 | 10 |
| Don S. Davis | Lt. Gen. George Hammond | Captain William Scully | 7 | 2 |
| Laara Sadiq | Technician Laura Davis | Female E.M.T. | 14 | 1 |
| Kevin McNulty | Dr. William Warner | Agent Fuller, Dr. Christopher Davey | 4 | 3 |
| Rob Lee | Major Ben Pierce | Amputee | 6 | 1 |
| Roger Cross | Laurence Conner | Field Agent, Officer Wentworth, Private Kittel | 2 | 4 |
| Garry Chalk | Col. Chekhov | Mad Dog | 10 | 1 |
| Douglas Arthurs | Heru'ur, Kah'l | Skin-Head Man | 4 | 1 |
Cast data from TVmaze, licensed CC BY-SA 4.0.