| Name | Character | Episodes |
|---|---|---|
| Mike Farrell | Dr. Sam March | 24 |
| Broderick Crawford | Dr. Peter Goldstone | 24 |
| Elaine Giftos | Bobbe March | 24 |
| Skip Homeier | Dr. Hugh Jacoby | 24 |
| Christopher Stone | Dr. Pooch Hardin | 24 |
| Sandra Smith | Dr. Lydia Thorpe | 24 |
| Stephen Brooks | Dr. Gregg Pettit | 24 |
| Lois Nettleton | 1 | |
| Skip Homeier | 1 | |
| Lew Ayres | 1 | |
| Geri Reischl | 1 |