All 143 actors in both ER and Star Trek: Voyager
143 actors have appeared in both ER and Star Trek: Voyager, across 503 episodes. The most-credited is Leland Orser, Dr. Lucien Dubenko in ER and Dejaren in Star Trek: Voyager.
| Actor | In ER | In Star Trek: Voyager | Eps | Eps |
|---|---|---|---|---|
| Leland Orser | Dr. Lucien Dubenko | Dejaren | 61 | 1 |
| Christine Harnos | Jennifer Greene | Tessa Omond | 28 | 1 |
| Josh Clark | Officer McCauly | Lt. Joseph "Joe" Carey | 1 | 7 |
| Raphael Sbarge | Mr. Kirkendall | Michael Jonas | 2 | 5 |
| Vaughn Armstrong | Greg Mitchell | Alpha Hirogen, Korath, Telek R'Mor | 1 | 5 |
| Daniel Dae Kim | Ken Sung | Gotana Retz | 4 | 1 |
| Brooke Ashley Stephens | Evette Anspaugh | Naomi Wildman | 2 | 2 |
| Jack Shearer | Hal Grunwald | Admiral Hayes, Admiral Strickler | 1 | 3 |
| Larry Hankin | Bearded Homeless Guy | Gaunt Gary | 1 | 3 |
| Scott Jaeck | Dr. Steven Flint | Cavit | 12 | 1 |
| Albie Selznick | Mr. Lanford | Tak Tak, Tash | 1 | 2 |
| Anthony De Longis | ENT | Kazon First Maje Culluh | 1 | 5 |
| Charles Esten | Dr. Barry Grossman | Dathan | 4 | 1 |
| Richard Herd | Dr. Murphy | Admiral Paris | 1 | 4 |
| Andy Dick | Tommy Brewer | EMH-2 | 1 | 1 |
| Deborah May | Nursing Director Mary Cain | Lyris | 7 | 1 |
| Eric Pierpoint | Mr. Dwyer | Kotar | 1 | 1 |
| Gregory Itzin | Burn Doctor | Dysek | 1 | 1 |
| Jay Leggett | Canelli | Phlox | 1 | 1 |
| Jeff Kober | Stuart | Iko | 1 | 1 |
| Kevin Tighe | Sgt. Pete Mattimore | Henry Janeway | 1 | 1 |
| Lisa Kaminir | Jessie | Lillias | 1 | 1 |
| Lori Petty | Shane | Noss | 1 | 1 |
| Louis Giambalvo | Security Guard David Hilliker | Cosimo | 1 | 1 |
| Mark Moses | Mr. Marks | Naroq | 1 | 1 |
| Michael Horton | Tom Angevine | Kovin | 1 | 1 |
| Mirron E. Willis | Detective Watkins | Rettik | 4 | 2 |
| Robert Knepper | Keith Reynolds | Gaul | 1 | 1 |
| Rosemary Forsyth | Judy | Alzen | 1 | 1 |
| Scott Lawrence | Children's Services Rep | Garon | 1 | 1 |
| Scott Lincoln | Fitzkee | Miner #1 | 1 | 1 |
| Tom Virtue | Pares | Supervisor, Lieutenant Walter Baxter | 1 | 3 |
| Wade Williams | Migraine Guy | Trajis Lo-Tarik | 1 | 1 |
| Wallace Langham | Dr. Melvoin | Flotter | 1 | 1 |
| Ted Rooney | Dr. Tabash | Varn | 6 | 1 |
| Ivar Brogger | Deposition Attorney | Barus, Orum | 1 | 2 |
| Jerome Butler | Talk Show Host | Korok | 1 | 2 |
| John Loprieno | Bernucci | Obrist | 1 | 2 |
| Megan Gallagher | Kathy Snyder | Jaryn | 2 | 1 |
| Patrick Kilpatrick | Matthew Lindermulder | Assan, Razik | 1 | 2 |
| Richard Riehle | Mandrake Patient | Seamus | 1 | 2 |
| Thomas Dekker | 4 Year Old Boy | Henry Burleigh | 1 | 2 |
| Tom Wright | Wharton | Tuvix | 2 | 1 |
| Louis Ortiz | Jorge | Culhane | 1 | 3 |
| Tim De Zarn | Mr. Krawczyk | Haliz, Yediq | 2 | 2 |
| John Prosky | Mr. Brooks | Otrin | 4 | 1 |
| Robert Picardo | Abraham Zimble | Dr. Lewis Zimmerman, Equinox EMH | 1 | 4 |
| Bahni Turpin | Mrs. Lattimer | Swinn | 1 | 2 |
| Ben Livingston | Mr. Gattney | Burkus | 1 | 1 |
| Carolyn Seymour | Dr. Skoft | Mrs. Templeton | 1 | 2 |
| Christopher Darga | Wilson | Y'Sek | 1 | 1 |
| Cully Fredricksen | Prosthetics Rep | Dareth | 1 | 1 |
| David Clennon | Jared Morgan | Dr. Crell Moset | 1 | 1 |
| Don Pugsley | Lloyd | Alien Visitor | 1 | 1 |
| F.J. Rio | Miguel Rivas | Joleg | 1 | 1 |
| Glenn Morshower | Rick Decoyte | Guard #1 | 1 | 1 |
| Googy Gress | Head Lac | Overlooker | 1 | 1 |
| Gwynyth Walsh | Barbara Knight | Chief Examiner Nimira | 1 | 1 |
| Hamilton Camp | Drunk | Vrelk | 1 | 1 |
| Jennifer Gatti | Melanie | Libby | 1 | 1 |
| John Rubinstein | Dr. Kenner | John Evansville | 1 | 1 |
| Joseph Ruskin | Mr. Kingsley | Vulcan Master | 1 | 1 |
| Karen Austin | Mrs. Carlson | Miral | 1 | 1 |
| Keith Szarabajka | Mr. DeLuca | Teero | 1 | 1 |
| Ken Magee | Security Guard Manager | Emck | 1 | 1 |
| Kenneth Tigar | Dr. Keinholz | Dammar | 2 | 1 |
| Lee Arenberg | Juke | Pelk | 1 | 1 |
| Mark Harelik | James | Inspector Kashyk | 1 | 1 |
| Michael Spound | Dwayne's Father | Lorrum | 1 | 2 |
| Michael Wiseman | Danny (Enforcer) | Beta-Hirogen | 1 | 2 |
| Nancy Youngblut | Sarah Howe | Taleen | 1 | 1 |
| Richard Zobel | Mr. Gehrhardt | Gaumen | 1 | 1 |
| Sandra Nelson | Michelle | Marayna | 1 | 1 |
| Scott MacDonald | Ambulance Driver, Detective | Rollins | 2 | 2 |
| Sherman Howard | Mr. Schoenberger | T'Greth | 1 | 1 |
| Tim Kelleher | U.S. Embassy Official | Four of Nine | 1 | 1 |
| Matt Williamson | Fireman #1, Ted | Security Officer #2, Klingon | 2 | 3 |
| Brad Greenquist | Mr. Butler | Demmas | 2 | 1 |
| Danny Goldring | Tony Logan | Alpha Hirogen | 1 | 2 |
| Francis Guinan | Police Negotiator | Minister Kray, Zar | 1 | 2 |
| Jeanette Miller | Beverly, Flora | Woman | 2 | 1 |
| Jeffrey Alan Chandler | Mr. Skapinski | Hatil | 2 | 1 |
| Armin Shimerman | Levine | Quark | 1 | 1 |
| Bertila Damas | Dr. Debra Wexler | Three of Nine | 1 | 1 |
| Catherine MacNeal | Anne | Henley | 1 | 1 |
| Cecile Callan | Leslie Cameron | Ptera | 1 | 1 |
| Charles Emmett | Derezin | Resh | 1 | 1 |
| Estelle Harris | Mrs. Markovic | Old Woman | 1 | 1 |
| Glenn Walker Harris, Jr. | Ruben | Jeffrey | 1 | 1 |
| Gregg Daniel | Mr. Powell | Mobar | 1 | 1 |
| Harve Presnell | Mr. Venema | Q colonel | 1 | 1 |
| Kathleen Garrett | Mrs. Meeker | Tanis | 1 | 1 |
| Kimble Jemison | Tom | Engineer | 1 | 1 |
| Lorna Raver | Dr. Anne Adelstein | Q | 1 | 1 |
| Marnie McPhail | Nurse Lisa Sailor | First Prelate Alcia | 1 | 1 |
| Michael Krawic | Willow | Rahmin | 1 | 1 |
| Randy Lowell | Dr. Shine | Torat | 3 | 1 |
| Randy Oglesby | PICU Doctor | Kir | 1 | 1 |
| Richard Fancy | Mr. Thomas | Alien | 1 | 1 |
| Scott Klace | Chris Halpern | Dremk | 1 | 1 |
| Stephen Rappaport | Matthew Hyams | Mutora | 1 | 1 |
| Wayne Péré | Eric Farve | Guill | 1 | 1 |
| Peter Dennis | Mosely | Admiral Hendricks, Sir Isaac Newton | 1 | 2 |
| Angela Paton | Mrs. Ransom | Aunt Adah | 1 | 1 |
| Brent Hinkley | Fred Hopper | Butch | 1 | 1 |
| Brian McNamara | Gil Brenner | Jack Lansing | 1 | 1 |
| David Selburg | Dr. Dyer | Toscat | 2 | 1 |
| Eve Brenner | Wilma | Jora Mirell | 1 | 1 |
| Jay Underwood | Mr. Burke | Crewman Mortimer Harren | 1 | 1 |
| Keene Curtis | Gilbert McCabe | Old Man No. 1 | 1 | 1 |
| Louis Ferreira | Michael Mueller | Trevis | 1 | 1 |
| Michael Kagan | Chuck Arteburn | Alien Commander | 1 | 1 |
| Paul Scherrer | Gardner | Voje | 1 | 1 |
| Robert Clendenin | Anesthesiologist | Vidiian Surgeon | 1 | 1 |
| Sarah Rayne | Sarah Bengossi | Elani | 1 | 1 |
| Scott Haven | P.K. Palmer IV | Kazon Engineer | 1 | 2 |
| Thomas Kopache | Dr. Stofsky | Viorsa | 1 | 1 |
| Tracey Ellis | Annette | Yifay, Icheb's Mother | 1 | 1 |
| Carlos Carrasco | Dominican Uncle | Bahrat | 1 | 1 |
| Lise Simms | Emcee | Annorax's Wife | 1 | 1 |
| Mel Winkler | Charles Sanberry | Jack Hayes | 1 | 1 |
| Michael Shamus Wiles | Battalion Chief Bukata | Bosaal | 1 | 1 |
| Paul O'Brien | Kicking Patient | Geral | 1 | 1 |
| Ron Fassler | Mr. Rosen | Morin | 1 | 1 |
| Patrick Kerr | George Deakins | Bothan | 2 | 1 |
| Dennis Cockrum | Little League Player's Father | Orek | 1 | 1 |
| Ian Patrick Williams | Supervisor | Doc Fitzgerald | 1 | 1 |
| Jessica Gaona | Holly | Young B'Elanna | 1 | 1 |
| Jim O'Heir | McKenna | Husband | 1 | 1 |
| John Cirigliano | Cabbie | Alien #1 | 1 | 1 |
| Karl Wiedergott | Dr. Krepp | Ameron | 1 | 1 |
| Michael Rivkin | Stan | Nunk | 1 | 1 |
| Miguel Pérez | Santiago Escalona | Physician | 1 | 1 |
| Mimi Craven | Mrs. Newberry | Jisa | 1 | 1 |
| Barry Gordon | Baxter | Broht | 1 | 1 |
| John Rosenfeld | FBI Agent Robert Clayton | Technician #1 | 1 | 1 |
| Mary Anne McGarry | Alice Wakely | Tabris | 1 | 1 |
| Michael McFall | Water Truck Driver | Salvage Alien #1 | 1 | 1 |
| Terrence Evans | Barry Mahoney | Ambassador Treen | 1 | 1 |
| Timothy McNeil | Rotolo | Miner #2 | 1 | 1 |
| Bairbre Dowling | Dorgan | Edith | 1 | 1 |
| Lorinne Vozoff | Marguerite | Irene Hansen | 1 | 1 |
| Damara Reilly | Estelle | Alien Surgeon | 1 | 1 |
Cast data from TVmaze, licensed CC BY-SA 4.0.