All 112 actors in both Smallville and Stargate Atlantis
112 actors have appeared in both Smallville and Stargate Atlantis, across 317 episodes. The most-credited is Kavan Smith, Wade Mahaney in Smallville and Major Lorne in Stargate Atlantis.
| Actor | In Smallville | In Stargate Atlantis | Eps | Eps |
|---|---|---|---|---|
| Kavan Smith | Wade Mahaney | Major Lorne | 1 | 29 |
| Paul McGillion | LexCorp Employee | Dr. Carson Beckett | 1 | 26 |
| Christopher Heyerdahl | Zor-El | Wraith Leader (Todd), Halling, Male Wraith | 2 | 22 |
| Sharon Taylor | Faora | Amelia Banks, Replicator Tech, Technician | 7 | 12 |
| Mike Dopud | Security Guard George | Kiryk | 10 | 1 |
| Ari Cohen | Regan Matthews | Tyrus | 6 | 1 |
| Michael Shanks | Carter Hall / Hawkman | Dr. Daniel Jackson | 4 | 3 |
| Anna Galvin | Gina | Dr. Vanessa Conrad | 5 | 1 |
| Anna Williams | Eva Greer, Monica | Female Tech | 5 | 1 |
| Craig Veroni | Security Guard, State Trooper | Dr. Peter Grodin | 2 | 9 |
| Garwin Sanford | Ed Brooks | Simon Wallis | 1 | 3 |
| Rob LaBelle | Dr. Fredrick Walden | Mr. Coolidge | 3 | 1 |
| Robert Picardo | Edward Teague | Richard Woolsey | 2 | 6 |
| Ron Selmour | Wendell Connelly | Jannick | 3 | 1 |
| Chelan Simmons | Felice Chandler, Rhonda the Cheerleader | Mara | 2 | 1 |
| Ryan Robbins | Louis Leery Jr. | Ladon Radim | 1 | 5 |
| Dean Marshall | Seattle Police Officer | Sgt. Bates | 1 | 10 |
| Chris Gauthier | Winslow Schott / Toyman, LuthorCorp Technician | Mattas | 4 | 1 |
| Leela Savasta | Gretchen Winters, Talon Girl | Vega, Esposito | 2 | 3 |
| Yan-Kay Crystal Lowe | Vala | Mardola | 4 | 1 |
| Ben Cotton | Paul Hendrix | Dr. Kavanagh | 1 | 6 |
| Linda Ko | Luthor Lawyer | Nurse Marie, Marie | 1 | 8 |
| Damon Johnson | Michael Westmore | Peterson | 1 | 1 |
| Dominic Zamprogna | Bruno Mannheim | Aries | 1 | 1 |
| Ecstasia Sanders | Talon Girl | Villager | 3 | 1 |
| Jodelle Ferland | Emily Dinsmore | Harmony | 1 | 1 |
| Lisa Marie Caruk | Mary | Heleen | 3 | 1 |
| Dan Payne | LuthorCorp Pilot | Wraith Warrior, Big Wraith, Lt. Reed | 2 | 5 |
| Brendan Penny | Wagner | Male Wraith, Wraith Leader (Todd), Wraith Scientist | 1 | 4 |
| Elias Toufexis | Bronson, Emil LaSalle, Luke | Replicator Tech | 3 | 2 |
| Alan C. Peterson | Senator Ed Burke | Magistrate | 2 | 1 |
| Dylan Neal | Ray Sacks | Dave Sheppard | 2 | 1 |
| Jody Thompson | Gia, Police Woman | Nurse | 2 | 1 |
| Heather Doerksen | Erica Poss | Bridge Pilot, Apollo Tech, Daedelus Crew Member | 1 | 6 |
| Kwesi Ameyaw | Darius | Tactical Officer | 3 | 1 |
| Panou | LuthorCorp Employee #1 | Cetus | 2 | 2 |
| Pascale Hutton | Raya, Karen Gallagher | First Officer | 3 | 1 |
| Sean Millington | Luthor Security Guard, Military police | Marine | 2 | 2 |
| Woody Jeffreys | Jack, Mr. Lyon | Bouncer | 2 | 2 |
| Aleks Paunovic | Orderly, Thug #1 | Rakai | 2 | 1 |
| Anne Openshaw | Special Agent Vanessa Webber | Pilot | 1 | 1 |
| Chelah Horsdal | Dr. McCann | Erran | 1 | 1 |
| Colby Johannson | David 'Coop' Cooper | Lt. Kagan | 1 | 1 |
| Daniel Bacon | FBI Agent | Dr. Watson | 2 | 1 |
| David Richmond-Peck | Director, March Sosnick, Pete O'Grady | Genii Field Captain | 3 | 1 |
| Kenneth Welsh | Drunk Santa | Jamus | 1 | 1 |
| Kimani Ray Smith | Bus Driver, Monitoring Astronomer | Dr. Lindstrom | 2 | 1 |
| Laura Mennell | Janet Dawson, Toni | Sanir | 2 | 1 |
| Lauro Chartrand | Alex, Thief | Genii Soldier | 2 | 1 |
| Matthew Walker | Dr. Hudson | Moros | 1 | 1 |
| Paul Jarrett | Scientist | Captain Hendricks | 1 | 1 |
| Richard Kahan | Brennan, Ted Biddleman | Baldric | 2 | 1 |
| Reece Thompson | Young Geoffrey | Jinto | 1 | 3 |
| Dan Joffre | D. Halifax | Barkeep | 2 | 1 |
| Ellie Harvie | Marge Manners | Dr. Lindsey Novak | 1 | 2 |
| John Shaw | Cave Scientist | Garth | 2 | 1 |
| Steve Archer | Deputy O'Conner | Generator-Room Guard | 2 | 1 |
| Adrian Hough | Dr. Robert Bethany | Genii Lieutenant | 1 | 1 |
| Brandy Ledford | Debra Burch | Narina | 1 | 1 |
| Brent Stait | Kent Nelson / Dr. Fate | Michael Kenmore | 1 | 1 |
| Calum Worthy | Garth Ranzz / Lightning Lad | Hunter Kid | 1 | 1 |
| Chiara Zanni | Nurse | Molina | 1 | 1 |
| David Lovgren | Derek Fox | Kelore | 1 | 1 |
| Dean Wray | Hiram Kent | Haemon | 1 | 1 |
| Ken Kirzinger | Scientist | Bartender | 1 | 1 |
| Mark Gibbon | Mr. Raines, Orderly, SWAT Commander | Constable | 3 | 1 |
| Matthew Harrison | Technician | Scientist #1 | 1 | 1 |
| Nels Lennarson | Ron Milano | Holland | 1 | 1 |
| Paul Lazenby | Tony | Genii Soldier | 1 | 1 |
| William MacDonald | Walt Masterson | Captain Hugh Griffin | 1 | 1 |
| Aleks Holtz | Gate Security Guard | Guard | 1 | 2 |
| Linden Banks | Jonah Doyle, Scientist | Dovelock | 2 | 1 |
| Peter Flemming | Brady | Agent Malcolm Barrett | 1 | 2 |
| Aaron Craven | Scientist | Commander Wraith | 1 | 1 |
| Colin Corrigan | Dante's Mechanic | Guard #2, Team Member | 1 | 2 |
| Curtis Caravaggio | Wingate Owner | Major Elliot Rutherford | 1 | 1 |
| Doug Chapman | Deputy | Sgt. Cole | 1 | 1 |
| Emy Aneke | Robert Pontius | Lt. Morrison | 1 | 1 |
| Glenn Ennis | Metropolis Police Officer | 1st Warrior | 1 | 1 |
| Kevin McNulty | Mr. Summers | Chancellor Lycus | 1 | 1 |
| Lara Gilchrist | Madelyn Hibbins | Dr. Hewston | 1 | 1 |
| Nickolas Baric | Thug #2 | Hester | 1 | 1 |
| Nico Ghisi | Alex Luthor | Kid | 1 | 1 |
| P.J. Prinsloo | Punk #1, Ron Troupe | Anders | 2 | 1 |
| Patrick Gallagher | Bartender | Vonos | 1 | 1 |
| Ryan Booth | Technician | Lt. Negley | 1 | 1 |
| Sarah Deakins | Reporter | Renni | 1 | 1 |
| Terence Kelly | Doctor | Orin | 1 | 1 |
| Brad Dryborough | Dr. Bauer | Lead Hybrid | 1 | 1 |
| Brandon Blue | Christopher Petry | Hybrid | 1 | 1 |
| Carmen Moore | Carmen | Reporter | 1 | 1 |
| G. Michael Gray | Buddy Brown | Sefaris | 1 | 1 |
| Jessica Amlee | Little Girl | Cleo | 1 | 1 |
| Leanne Adachi | Nurse | Lia | 1 | 1 |
| Michael Coleman | Bert Camp | Front Desk Guy | 1 | 1 |
| Michael Puttonen | Dr. Caselli | Smeadon | 1 | 1 |
| Michael Tayles | Deputy Kaiden | Dr. Graydon | 1 | 1 |
| Ona Grauer | Dr. Gabrielle Vaughan | Female Ancient | 1 | 1 |
| Richard Stroh | Davidson | Genii Soldier | 1 | 1 |
| Santo Lombardo | Holmes | Athosian | 1 | 1 |
| David MacInnis | EMT #2 | Talus | 1 | 2 |
| Chris Kalhoon | Lex's Assistant | Crewman | 1 | 1 |
| Colin Cunningham | Nicky Taylor | Major Paul Davis | 1 | 1 |
| Cory Monteith | Frat Cowboy | Genii Private | 1 | 1 |
| David Orth | Soldier with Microphone | Captain | 1 | 1 |
| Lucia Walters | Belinda Jenkins | Lara | 1 | 1 |
| Jason Coleman | Deputy Chorney | Larrin's Crewman | 1 | 1 |
| Graham Kosakoski | Danny Cormay | Aurora Guard | 1 | 1 |
| Christian Sloan | Ben | Hybrid | 1 | 1 |
| Jeremy Jones | Henry's Father | Edison | 1 | 1 |
| Aaron Dudley | Bartender | Male Ancient | 1 | 1 |
| Brandy Kopp | Young Woman | Pretty Marine | 1 | 1 |
← Smallville × Stargate Atlantis
Cast data from TVmaze, licensed CC BY-SA 4.0.