All 61 actors in both Stargate Atlantis and The X-Files
61 actors have appeared in both Stargate Atlantis and The X-Files, across 318 episodes. The most-credited is Mitch Pileggi, Col. Steven Caldwell in Stargate Atlantis and Assistant Director Walter Skinner in The X-Files.
| Actor | In Stargate Atlantis | In The X-Files | Eps | Eps |
|---|---|---|---|---|
| Mitch Pileggi | Col. Steven Caldwell | Assistant Director Walter Skinner | 22 | 70 |
| Paul McGillion | Dr. Carson Beckett | Fred Neiman | 26 | 1 |
| Bill Dow | Dr. Bill Lee | Dr. Charles Burks, Dad, Dr. Rick Newton | 7 | 9 |
| Jewel Staite | Dr. Jennifer Keller, Ellia | Amy Jacobs | 13 | 1 |
| Brendan Beiser | Tavius | Agent Sean Pendrell | 1 | 10 |
| Amanda Tapping | Lt. Colonel Samantha Carter | Carina Sayles | 5 | 1 |
| Ryan Robbins | Ladon Radim | Murphy | 5 | 1 |
| William MacDonald | Captain Hugh Griffin | Agent Dan Kazanjian, Buddy Riggs, Dr. Oppenheim | 1 | 5 |
| Sharon Taylor | Amelia Banks, Replicator Tech, Technician | Diana Eggers | 12 | 1 |
| Karin Konoval | Second in Command | Little Chucky Poundstone, Little Judy Poundstone, Madame Zelma | 1 | 3 |
| Scott Heindl | Male Wraith, Wraith, Wraith Leader | Billy | 6 | 1 |
| Ben Cotton | Dr. Kavanagh | Mr. Paulsen | 6 | 2 |
| Erin Chambers | Sora | Anna Strong | 3 | 1 |
| Kevin McNulty | Chancellor Lycus | Agent Fuller, Dr. Christopher Davey | 1 | 3 |
| Mike Dopud | Kiryk | Mr. Y's Henchman | 1 | 1 |
| Alan C. Peterson | Magistrate | Mr. Y | 1 | 2 |
| Don S. Davis | Lieutenant General George S. Hammond | Captain William Scully | 1 | 2 |
| Jay Brazeau | Lord Protector | Dr. Daly, Professor Varnes | 1 | 2 |
| Brent Stait | Michael Kenmore | Timothy Mayhew, Corp. Taylor | 1 | 3 |
| Sean Campbell | Solen Sincha | Local Cop, Officer Sean | 2 | 2 |
| Megan Leitch | Captain Helia | Samantha Mulder | 1 | 4 |
| Dean Wray | Haemon | Rich Turner, Tow Truck Driver | 1 | 2 |
| Kenneth Welsh | Jamus | Simon Gates / Millenium Man | 1 | 1 |
| Matthew Walker | Moros | Arlinsky, Dr. Ronald Surnow | 1 | 2 |
| Michael Puttonen | Smeadon | Conductor, Dr. Pilsson, Martin Allpert | 1 | 4 |
| Robert Moloney | Koracen | Bruce Bearfeld, Worker | 1 | 2 |
| Stephen Dimopoulos | Goran | Detective, Ionesco | 1 | 2 |
| BJ Harrison | Female Merchant | Clerk, Hannah | 1 | 2 |
| Ellie Harvie | Dr. Lindsey Novak | OPO Staffer | 2 | 1 |
| Kerry Sandomirsky | Asuran Counselor 2 | Joanne Steffen, Tracey | 1 | 2 |
| Robert Thurston | Zarah | Dr. Larry Steen, Jackson Toews | 1 | 2 |
| Colin Cunningham | Major Paul Davis | Dr. Henry Stroman, Escalante, Lt. Terry Wilmer | 1 | 3 |
| Danny Trejo | Omal | Cesar Ocampo | 1 | 1 |
| Dexter Bell | Sgt. Barraso | Alfred Kittel | 1 | 1 |
| Laura Harris | Nola | Andrea | 1 | 1 |
| Marshall Bell | Terrence Kramer | Commander Calvin Henderson | 1 | 1 |
| Michael Cram | Silas | Officer Corning | 1 | 1 |
| Rob LaBelle | Mr. Coolidge | Brad Wilczek | 1 | 1 |
| Barry Greene | Hendon | Dr. Emile Linzer, Perkins | 1 | 2 |
| Johnny Cuthbert | Fortnum | Commanding Officer, Tiernan | 1 | 2 |
| Peter Flemming | Agent Malcolm Barrett | Officer #1 | 2 | 1 |
| Stephen E. Miller | Dr. Richard Poole | Coroner Truitt, Tactical Commander | 1 | 2 |
| Brenda McDonald | Charin | Auntie Janet, Mrs. Loach | 2 | 2 |
| David Bloom | Eldred | Stress Man | 1 | 1 |
| David Neale | Genii Soldier, Ancient Pilot | Navy Base Guard | 3 | 1 |
| Paul Jarrett | Captain Hendricks | James Earl Ray, Upshaw | 1 | 2 |
| David Lovgren | Kelore | Kurt Crawford | 1 | 1 |
| Ken Kirzinger | Bartender | Richter | 1 | 1 |
| Linden Banks | Dovelock | Joseph Patnik, Reverend Sistrunk | 1 | 2 |
| Amanda Burke | Ancient Scientist | Rebecca | 1 | 1 |
| Darren Dolynski | Mirellus | Man in Suit | 1 | 1 |
| Simon Longmore | Tathal | Marty Fox | 1 | 1 |
| Terence Kelly | Orin | George Usher | 1 | 1 |
| Kwesi Ameyaw | Tactical Officer | Judge | 1 | 1 |
| Mark Gibbon | Constable | Guard | 1 | 1 |
| Ari Solomon | Billick | Bernard Gauthier | 1 | 1 |
| Jason Diablo | Guard | Angry Man | 1 | 1 |
| John Tierney | Astrum | Dr. Jacobs | 1 | 1 |
| Dan Shea | Sgt. Sylvester Siler | Deputy | 1 | 1 |
| Jeremy Jones | Edison | Sergeant | 1 | 1 |
| John Sampson | Human guard | Marksman #1 | 1 | 1 |
← Stargate Atlantis × The X-Files
Cast data from TVmaze, licensed CC BY-SA 4.0.