All 68 actors in both Riverdale and Smallville
68 actors have appeared in both Riverdale and Smallville, across 354 episodes. The most-credited is Martin Cummins, Tom Keller, Mayor Keller in Riverdale and Dr. Lawrence Garner in Smallville.
| Actor | In Riverdale | In Smallville | Eps | Eps |
|---|---|---|---|---|
| Martin Cummins | Tom Keller, Mayor Keller | Dr. Lawrence Garner | 78 | 3 |
| Alvin Sanders | Pop Tate | Dale Ross, Dr. Klein | 70 | 2 |
| Lochlyn Munro | Hal Cooper | Orlando Block | 51 | 1 |
| Ryan Robbins | Frank Andrews | Louis Leery Jr. | 39 | 1 |
| Malcolm Stewart | Dr. Freiderich Werthers, Francis Dupont | Dr. Otis Ford, Dr. Sinclair, Jim Melville | 26 | 3 |
| Alaina Huffman | Twyla Twyst | Dinah Lance / Black Canary | 7 | 6 |
| Barclay Hope | Clifford Blossom, Claudius Blossom | Dr. Anthony Bright, Doctor | 29 | 3 |
| Colin Lawrence | Coach Clayton | Agent Stocker, Captain Nichols, Doctor | 6 | 3 |
| Sharon Taylor | Tia Margot | Faora | 1 | 7 |
| Fred Henderson | Governor Dooley | Dr. Langston | 3 | 4 |
| Greyston Holt | Glen Scot | Tobias Rice | 10 | 1 |
| Jerry Wasserman | Mr. Lazenby | Dr. Yaeger Scanlan | 1 | 4 |
| Ron Selmour | Toots Sweet | Wendell Connelly | 1 | 3 |
| William MacDonald | Principal Featherhead, Warden Norton | Walt Masterson | 19 | 1 |
| Alison Araya | Janet Weiss | Nurse | 12 | 1 |
| Beverley Breuer | Sister Woodhouse | Rose Greer | 10 | 1 |
| Chris Shields | Mr. Logan | Courier, EMT #1, Reporter | 1 | 4 |
| Mackenzie Gray | Dr. Curdle | Dr. Alistair Kreig, Lex Luthor Clone | 3 | 2 |
| Juan Riedinger | Dodger Dickenson | Lowell Wilson | 6 | 1 |
| Kwesi Ameyaw | Dr. Masters | Darius | 2 | 3 |
| Lori Ann Triolo | Agent Ardelia | Lt. Trotter | 2 | 3 |
| Christopher Shyer | Brad Rayberry | Nicholas Conroy | 2 | 1 |
| Paul Lazenby | Manager, Inmate #1 | Tony | 3 | 1 |
| Brad Mann | Leo | Twin #1 | 4 | 1 |
| Azura Skye | Darla Dickenson | Amy Palmer | 5 | 1 |
| Adrian Hough | Doc | Dr. Robert Bethany | 2 | 1 |
| Alex Zahara | Uncle Bedford | Dr. Jansen | 2 | 1 |
| Doug Chapman | Trash Bag Killer, Dennis | Deputy | 3 | 1 |
| Paul Jarrett | Arthur "Artie" Andrews | Scientist | 1 | 1 |
| Sean Millington | Hammer | Luthor Security Guard, Military police | 1 | 2 |
| Todd Mann | Nico | Twin #2 | 4 | 1 |
| Link Baker | Captain Golightly | Pilot | 4 | 1 |
| Mark Gibbon | Carl Martin | Mr. Raines, Orderly, SWAT Commander | 2 | 3 |
| Kendall Cross | Ranger | Jessica Kent, Lara-El, Little Girl's Mother | 1 | 3 |
| Linden Banks | Newsstand Vendor | Jonah Doyle, Scientist | 2 | 2 |
| Peter New | Bobby | Coffee Shop Employee | 3 | 1 |
| Dean McKenzie | Terrence | Lex's Campaign Manager | 1 | 2 |
| Veena Sood | Headmistress Patricia | Schoolteacher | 1 | 2 |
| Michael St. John Smith | Coach Kleats | Dr. Thomas Burton, General | 3 | 2 |
| Tony Todd | Farmer McGinty | Earl Jenkins | 1 | 1 |
| Sandy Wayne Robson | Ted Bishop | Ellis | 2 | 1 |
| Steve Makaj | Jinx Malloy | Coach Calloway, Contractor | 1 | 2 |
| Birkett Turton | David | Jeff Palmer | 3 | 1 |
| Christian Sloan | Shady Man | Ben | 2 | 1 |
| Christine Chatelain | Mrs. Chipping | Tempest Drake | 1 | 1 |
| Darcy Hinds | Randy Ronson | VRA Op Officer | 2 | 1 |
| Gardiner Millar | General Taylor | FBI Agent | 3 | 1 |
| Nickolas Baric | Henchman #1 | Thug #2 | 1 | 1 |
| Angela Moore | Sister Agnes | DNA Doctor | 2 | 1 |
| Ben Cotton | Michael Matthews | Paul Hendrix | 1 | 1 |
| Michael Puttonen | Junkyard Steve | Dr. Caselli | 1 | 1 |
| Tom Pickett | Minister | Principal Terrence Reynolds | 1 | 1 |
| Elizabeth Thai | Proctor | Mary | 1 | 1 |
| Glynis Davies | Miss Haggly | Mrs. Palmer | 1 | 1 |
| Jase Anthony Griffith | Stonewall Coach | Belle Reve Guard | 1 | 1 |
| Jeremy Jones | Debt Collector #1 | Henry's Father | 2 | 1 |
| Catherine Lough Haggquist | Mrs. Tate | Mary | 1 | 1 |
| Dean Marshall | Jack Walsh | Seattle Police Officer | 1 | 1 |
| Glenn Ennis | Henchman #3 | Metropolis Police Officer | 1 | 1 |
| Jaeson Lee | Berserker | Neutron | 1 | 1 |
| Kevan Ohtsji | Club Manager | Danny Kwan | 1 | 1 |
| Karen Holness | Mrs. Logan | Jessica Bishop | 1 | 1 |
| Matthew Harrison | Mr. Wallis | Technician | 1 | 1 |
| Cameron Park | Restaurant Owner #2 | Photographer (Deleted scene) | 1 | 1 |
| Candus Churchill | Ms. Moore | Nurse | 1 | 1 |
| Patrick Keating | Willie | Dr. Heller | 1 | 1 |
| Lane Edwards | Paul Sowerberry | Agent James Shepard | 1 | 1 |
| Terry O'Sullivan | Female Alumni | TBD | 1 | 1 |
Cast data from TVmaze, licensed CC BY-SA 4.0.