| Narrator? (78 episodes 1955-1957) | Truman Bradley | |
| Dr. Edwards? (7 episodes 1955-1956) | Michael Fox | |
| Dr. Albert Neville? (7 episodes 1955-1956) | 马歇尔·汤普森
 | |
| Dr. Dan Scott? (6 episodes 1955-1957) | Peter Hansen | |
| Dr. Cole? (6 episodes 1955-1957) | Walter Kingsford | |
| Amy Kern? (6 episodes 1955-1957) | Rachel Ames | |
| Dr. Hugh Bentley? (5 episodes 1955-1957) | 布鲁斯·本内特
 | |
| Agent John Randall? (5 episodes 1955-1957) | Charles Maxwell | |
| Dr. Jeff Conover? (5 episodes 1955-1956) | 阿瑟·弗兰兹
 | |
| Bill Twining? (5 episodes 1955-1957) | 比尔·威廉姆斯
 | |
| Charles Irwin? (4 episodes 1955-1956) | Michael Garth | |
| Bill - doctor with package? (4 episodes 1955-1956) | Tom McKee | |
| Ada March? (4 episodes 1955-1956) | Jean Byron | |
| Dr. Clausen? (4 episodes 1955-1956) | Morris Ankrum | |
| Detective Sergeant? (4 episodes 1955-1956) | John Mitchum
 | |
| Dr. Kenneth White? (4 episodes 1955-1957) | Cyril Delevanti
 | |
| George? (4 episodes 1955-1957) | Hank Patterson | |
| Johnson? (4 episodes 1955-1956) | Paul Hahn | |
| Alma Ford? (4 episodes 1955-1957) | Kristine Miller | |
