| Name | Character | Episodes |
|---|---|---|
| Sheryl Lee | Dr. Sarah Church | 24 |
| Ken Olin | Dr. Roger Cattan | 24 |
| Matt Craven | Dr. Tim Lonner | 24 |
| Rick Roberts | Dr. Evan Newman | 24 |
| Vanessa Williams | Dr. Leanne Barrows | 3 |
| Robin Williams | Hugo Kingsley | 1 |
| James Le Gros | 1 | |
| Corin Nemec | 1 | |
| Lisa Eichhorn | 1 | |
| Kenneth Mars | 1 | |
| Lawrence Hilton-Jacobs | 1 | |
| Michael J. Pollard | 1 | |
| Richard Lawson | 1 | |
| Peter Jurasik | 1 | |
| Stanley Kamel | Dr. Crosswell | 1 |
| Scott Bryce | 1 | |
| Brittany Paige Bouck | 1 | |
| Elizabeth Norment | Caroline's Doctor | 1 |
| Don Keith Opper | 1 | |
| Alex Thomas | David Lee | 1 |
| Kim Murphy | Stephanie Weller | 1 |