| Name | Character | Episodes | 
|---|---|---|
| Robert Wagner | Dr. Nick Sloan | 2 | 
| Louis Gossett Jr. | Lem Harper | 2 | 
| Scott Marlowe | Dr. Albert Dubron | 2 | 
| Lloyd Bridges | Dr. Dan J. Lassiter | 2 | 
| Buddy Ebsen | Charles Sprague | 2 | 
| Melinda Dillon | Dr. Kris Lassiter | 2 | 
| Richard Basehart | Matt Kinsella | 2 | 
| Felton Perry | Dr. Hill | 2 | 
| Joanne Linville | Nan Forrester | 2 | 
| Noble Willingham | Charlie | 2 | 
| Barbara Parkins | Angela Adams | 2 | 
| Pat Harrington, Jr. | Jimmy Regosi | 2 | 
| John Larch | Sprony | 2 | 
| James Whitmore Jr. | Dr. Jack Hermanson | 2 | 
| Wright King | Dr. Kenderly | 2 | 
| Russ Marin | Ed Moorehead | 2 | 
| Ben Piazza | Dr. Henry de Jong | 2 | 
| Ken Howard | Nels Freiberg | 2 | 
| Regis Cordic | Chairman | 2 | 
| Will Hare | Emmonds | 2 | 
| Jesse Dizon | Dr. Levine | 2 | 
| Jim Antonio | Detweiler | 2 | 
| Hildy Brooks | Ruth | 2 | 
| Joan Tompkins | Judge Morton | 2 | 
| Steve Gravers | Senator | 2 | 
| Brad David | Andrew Vivienne | 2 | 
| Lin McCarthy | Ned Josephson | 2 |