All 139 actors in both ER and Star Trek: The Next Generation
139 actors have appeared in both ER and Star Trek: The Next Generation, across 509 episodes. The most-credited is Scott Grimes, Dr. Archie Morris in ER and Eric in Star Trek: The Next Generation.
| Actor | In ER | In Star Trek: The Next Generation | Eps | Eps |
|---|---|---|---|---|
| Scott Grimes | Dr. Archie Morris | Eric | 26 | 1 |
| Patti Yasutake | Kito | Alyssa Ogawa | 1 | 17 |
| Mädchen Amick | Wendall Meade | Anya as Teenage Girl | 10 | 1 |
| Rosalind Chao | Dr. Theresa Chow | Keiko O'Brien | 1 | 8 |
| Gina Ravera | Dr. Bettina DeJesus | Ensign Taylor | 13 | 1 |
| James Cromwell | Bishop Stewart | Jaglom Shrek, Nayrok | 4 | 3 |
| Sam Anderson | Dr. Jack Kayson | Assistant Manager | 19 | 1 |
| Armin Shimerman | Levine | Betazoid Gift Box, DaiMon Bractor, Letek | 1 | 4 |
| Clyde Kusatsu | Review Board Doctor #1 | Admiral Nakamura | 1 | 4 |
| Penny Johnson Jerald | Nurse Practitioner Lynette Evans | Dobara | 9 | 1 |
| Scott Jaeck | Dr. Steven Flint | Administrator | 12 | 1 |
| Megan Cole | Pathologist Dr. Upton | Noor | 7 | 1 |
| Kirsten Dunst | Charlene "Charlie" Chiemingo | Hedril | 6 | 1 |
| Glenn Morshower | Rick Decoyte | Ensign Burke, Orton | 1 | 2 |
| Lee Arenberg | Juke | DaiMon Bok, DaiMon Prak | 1 | 2 |
| Marco Rodríguez | Agent Serena | Capt. Paul Rice, Glinn Telle | 1 | 2 |
| Stephen Lee | Mr. Dressler | Bartender, Chorgan | 1 | 2 |
| Thomas Kopache | Dr. Stofsky | Engineer, Mirok | 1 | 2 |
| Mike Genovese | Officer Al Grabarsky | Desk Sergeant | 12 | 1 |
| Charles Esten | Dr. Barry Grossman | Divok | 4 | 1 |
| Anne Haney | Mrs. Packer | Rishon Uxbridge | 1 | 1 |
| Brian Cousins | Allman | Crosis, Parem | 1 | 3 |
| Carolyn Seymour | Dr. Skoft | Cmdr. Toreth, Mirasta Yale, Sub Cmdr. Taris | 1 | 3 |
| Clayton Rohner | Roger Anderson | Admiral Mark Jameson | 1 | 1 |
| Eric Pierpoint | Mr. Dwyer | Voval | 1 | 1 |
| Gwynyth Walsh | Barbara Knight | B'Etor | 1 | 3 |
| Mark Rolston | Officer Thomas | Lt. Walter Pierce | 1 | 1 |
| Richard Cox | Rick Mathers | Kyril Finn | 1 | 1 |
| Vaughn Armstrong | Greg Mitchell | Captain Korris | 1 | 1 |
| Vyto Ruginis | Paramedic Wright | Chief Engineer Logan | 3 | 1 |
| J.P. Hubbell | EMT Lars Audia | Ensign | 15 | 1 |
| Skip Stellrecht | Chaplain Miller | Engineering Crewman | 4 | 1 |
| Christopher Michael | Security Officer | Coalition Lieutenant | 5 | 1 |
| Cristine Rose | Mrs. Martinez | Gi'ral | 1 | 2 |
| Mike Hagerty | Mr. James | Captain Larg, Skoran | 1 | 2 |
| Ed Lauter | Fire Captain Dannaker | Lt. Cmdr. Albert | 6 | 1 |
| Marcelo Tubert | Galloway | Jared | 3 | 1 |
| Rhonda Aldrich | Mrs. Reiser | Madeline | 1 | 3 |
| Liz Vassey | Liz | Kristin | 4 | 1 |
| David Selburg | Dr. Dyer | Dr. Syrus, Whalen | 2 | 2 |
| David Spielberg | Dr. Neil Bernstein | Cmdr. Hutchinson | 4 | 1 |
| Ellen Geer | Mrs. Ferguson | Dr. Kila Marr | 1 | 1 |
| Erich Anderson | Mr. Bradley | Cmdr. Kieran MacDuff | 1 | 1 |
| Gabriel Damon | Tommy | Jeremy Aster | 1 | 1 |
| Gina Hecht | Radiology Tech | Manua Apgar | 2 | 1 |
| Joanna Miles | Mrs. Larson | Perrin | 1 | 2 |
| John Pyper-Ferguson | Tom Coggins | Eli Hollander | 1 | 1 |
| Kerrie Keane | Melissa Walker | Alexana Devos | 1 | 1 |
| Lawrence Tierney | Jack Johnson | Cyrus Redblock | 1 | 1 |
| Max Grodénchik | Street Vendor | Par Lenor, Sovak | 1 | 2 |
| Page Leong | Gloria, Erin | Ensign April Anaya | 3 | 1 |
| Paul Eiding | Kaminski | Loquel | 1 | 1 |
| Richard Herd | Dr. Murphy | L'Kor | 1 | 2 |
| Richard Riehle | Mandrake Patient | Batai | 1 | 1 |
| Sam Hennings | U.S. Financial Attaché Steven Davidson | Ramsey | 1 | 1 |
| Stefan Gierasch | Daniel | Dr. Hal Moseley | 1 | 1 |
| Stephanie Erb | Mrs. Kinney | Liva | 1 | 1 |
| Castulo Guerra | Judge Alter, Javier | Dr. Seth Mendoza | 3 | 1 |
| Pamela Kosh | Emma Scott | Jessel, Mrs. Carmichael | 1 | 3 |
| Bruce Gray | Carter Board member, Dr. Munch | Admiral Chekote | 2 | 1 |
| Daniel Roebuck | Kyle Martin | Jaron | 1 | 2 |
| George Murdock | Mr. Sidowski | Admiral J. P. Hanson | 1 | 2 |
| Jennifer Gatti | Melanie | Ba'el | 1 | 2 |
| Ann Shea | Day Care Worker Valerie | Nellen Tore | 3 | 1 |
| Barbara Tarbuck | Alice Presley | Governor Leka Trion | 1 | 1 |
| Dennis Cockrum | Little League Player's Father | Alien Captain | 1 | 1 |
| Eileen Seeley | Mrs. Maryanski | Ard'rian McKenzie | 1 | 1 |
| John P. Connolly | Officer Billy | Lote | 1 | 1 |
| Michael Cavanaugh | Suzanne's Dad | Captain Robert DeSoto | 1 | 1 |
| Robert Knepper | Keith Reynolds | Wyatt Miller | 1 | 1 |
| Saxon Trainor | Karen Simms | Lt. Linda Larson | 1 | 1 |
| Seymour Cassel | Alfred Gower | Lt. Cmdr. Hester Dealt | 1 | 1 |
| Sherman Howard | Mr. Schoenberger | Captain Endar | 1 | 1 |
| Stanley Kamel | Dr. Fin Loech | Kosinski | 1 | 1 |
| Tim Russ | Dr. Medford | Devor | 1 | 1 |
| Tzi Ma | Mr. Yeung | Biomolecular Physiologist | 1 | 1 |
| Mirron E. Willis | Detective Watkins | Vorn | 4 | 1 |
| Scott MacDonald | Ambulance Driver, Detective | N'Vek | 2 | 1 |
| Shaun Duke | Detective, Painter | Ensign Gillespie | 2 | 1 |
| Shelby Leverington | Bruneau, Leeza Trudeau | Transporter Chief Brossmer | 2 | 1 |
| Todd Merrill | Jagman | Ensign Gleason | 1 | 2 |
| Ann Gillespie | Mrs. Ellis | Ensign Hildebrant | 1 | 1 |
| Benjamin W. S. Lum | Judge | Jim Shimoda | 1 | 1 |
| Charley Lang | Jason Warren | Duffy | 1 | 1 |
| Earl Billings | Ray Jamison | Admiral Thomas Henry | 1 | 1 |
| Ellen Albertini Dow | Mrs. Riblet | Felisa Howard | 1 | 1 |
| Eve Brenner | Wilma | Inad | 1 | 1 |
| Herta Ware | Mrs. Franks | Yvette Picard | 1 | 1 |
| Isabel Lorca | Cheryl | Gabrielle | 1 | 1 |
| J.D. Cullum | Munchausen Patient | Toral | 1 | 2 |
| Jane Daly | Diane Armitage | Varria | 1 | 1 |
| John Cothran, Jr. | Dennis Gant, Sr. | Captain Nu'Daq | 1 | 1 |
| Josh Clark | Officer McCauly | Conn Officer | 1 | 1 |
| Mark Bramhall | Weisner | Gul Nador | 1 | 1 |
| Michael Harris | Pete Tuteur | Byleth | 1 | 1 |
| Nan Martin | Mrs. Curwane | Victoria Miller | 1 | 1 |
| Patti Tippo | Debby | Nurse Temple | 1 | 1 |
| Randy Oglesby | PICU Doctor | Scholar | 1 | 1 |
| Raymond D. Turner | Security Guard | Teacher | 1 | 1 |
| Reg E. Cathey | David Haskell | Morag | 1 | 1 |
| Shelly Desai | Cabbie | V'Sal | 2 | 1 |
| Simon Templeman | Gareth | John Bates | 1 | 1 |
| Steven Anderson | Dr. Davitch | Dr. Nilrem | 2 | 1 |
| Tim De Zarn | Mr. Krawczyk | Satler | 2 | 1 |
| Albert Hall | James Anderson | Galek Dar | 1 | 1 |
| Albie Selznick | Mr. Lanford | Juggler | 1 | 1 |
| Amy Pietz | Loren | Lieutenant Sandra Rhodes | 1 | 1 |
| Bruce Beatty | Howard | Ben | 1 | 1 |
| Clement von Franckenstein | Mr. Darcy | Gentleman | 1 | 1 |
| James Lashly | Eddie | Ensign Kopf | 1 | 1 |
| John Christian Graas | Max Nielsen | Jay Gordon | 1 | 1 |
| Judyann Elder | Debra Graham | Lt. Ballard | 1 | 1 |
| Kay E. Kuter | Mr. Seaton | Cytherian | 1 | 1 |
| Marc Lawrence | Mr. Newton | Volnoth | 1 | 1 |
| Mario Roccuzzo | Mr. Tanzi | Arthur Malencon | 1 | 1 |
| Nicholas Cascone | Howard Mills | Davies | 1 | 1 |
| Richard Fancy | Mr. Thomas | Captain Satelk | 1 | 1 |
| Robert Ellenstein | Dr. Swanson | Steven Miller | 1 | 1 |
| Shannon Cochran | Mrs. Klingman | Kalita | 1 | 1 |
| Fran Bennett | Michelle, Phyllis | Admiral Shanthi | 2 | 1 |
| Tim Kelleher | U.S. Embassy Official | Lieutenant Gaines | 1 | 2 |
| Douglas Rowe | Dr. Arndt | Debin | 1 | 1 |
| Ken Meseroll | Mr. Sawyer | Ensign McDowell | 1 | 1 |
| Michael Reilly Burke | Dick White | Goval | 1 | 1 |
| Shay Astar | Amy Thompson | Isabella | 1 | 1 |
| Dick Miller | Mr. Ackerman | Vendor | 1 | 1 |
| James Gleason | Garrett Palsey | Dr. Appollinaire | 1 | 1 |
| Kieran Mulroney | Marty's Father | Benzan | 1 | 1 |
| Raye Birk | Mr. Hartley | Wrenn | 1 | 1 |
| Time Winters | Emil Savka | Glinn Daro | 1 | 1 |
| Derek Webster | Officer Kenny Grant | Lieutenant Sanders | 1 | 1 |
| Robert Costanzo | Pernicious Anemia Man | Slade Bender | 1 | 1 |
| Basil Wallace | Mr. Campbell | Kling Guard #1 | 1 | 1 |
| Charles Gunning | Denardo | Miner #3 | 1 | 1 |
| Graham Jarvis | Francis | Klim Dokachin | 1 | 1 |
| Karen Hensel | Keller | Admiral Brackett | 1 | 1 |
| Michael Hungerford | Mr. Lawrence | Roughneck | 1 | 1 |
| Morgan Nagler | Natalie Logan | Child #1 | 1 | 1 |
| Amy Wheaton | Shannon Wallace | Tara | 1 | 1 |
← ER × Star Trek: The Next Generation
Cast data from TVmaze, licensed CC BY-SA 4.0.