Actors in both ER and St. Elsewhere
121 actors have appeared in both ER and St. Elsewhere, across 468 episodes. The most-credited is Bonnie Bartlett, Ruth Greene in ER and Ellen Craig in St. Elsewhere.
| Actor | In ER | In St. Elsewhere | Eps | Eps |
|---|---|---|---|---|
| Bonnie Bartlett | Ruth Greene | Ellen Craig | 2 | 36 |
| Barbara Whinnery | Mrs. Draper | Dr. Cathy Martin | 1 | 32 |
| Lily Mariye | Nurse Lily Jarvik | Nurse Sherry Long | 127 | 1 |
| Deborah May | Nursing Director Mary Cain | Terri Valere | 7 | 11 |
| Nancy Stafford | Alan's Mom | Joan Halloran | 1 | 7 |
| Byron Stewart | Mr. Layton | Warren Coolidge | 1 | 17 |
| Beah Richards | Mae Benton | Regina | 8 | 1 |
| Ernie Hudson | Colonel James Gallant | Jerry Close | 2 | 6 |
| Sam Anderson | Dr. Jack Kayson | Mr. McGrath | 19 | 1 |
| Tom Poston | Earl | Jim Morrison | 2 | 1 |
| Piper Laurie | Sarah Ross | Fran Singleton | 2 | 3 |
| Akosua Busia | Kubby Ikabo | Debra Etting | 5 | 1 |
| Karen Austin | Mrs. Carlson | Dr. Mary Woodley | 1 | 3 |
| Dan Hedaya | Herb Spivak | Joseph Keuhnelian | 4 | 3 |
| Ann Hearn | Shelly Dunleavy | Andrea Fordham | 1 | 4 |
| Jamie Rose | Marilyn Bracken | Dr. Susan Birch | 1 | 4 |
| Bill Macy | Richard Gould | Hershel Millstein | 1 | 2 |
| Ed Lauter | Fire Captain Dannaker | Stan Morgen | 6 | 1 |
| Al Ruscio | Mr. Dellanova | Raleigh, Mr. Morlin | 1 | 3 |
| Brian McNamara | Gil Brenner | Michael Endicott | 1 | 3 |
Cast data from TVmaze, licensed CC BY-SA 4.0.