| Dr. Barnaby Fulton | 加里·格兰特
 | |
| Mrs. Edwina Fulton | 金格尔·罗杰斯
 | |
| Miss Lois Laurel | 玛丽莲·梦露
 | |
| Mr. Oliver Oxley | 查尔斯·科本
 | |
| Hank Entwhistle | 休·马洛威
 | |
| Dr. Jerome Kitzel | Henri Letondal | |
| Dr. Zoldeck | Robert Cornthwaite | |
| G.J. Culverly | Larry Keating
 | |
| Dr. Brunner | Douglas Spencer | |
| Mrs. Rhinelander | Esther Dale | |
| Little Indian | 乔治·温斯罗
 | |
| Student (uncredited) | Charlotte Austin | |
| Scientist (uncredited) | Harry Bartell | |
| Dowager (uncredited) | Faire Binney | |
| Reporter (uncredited) | 小哈里·凯瑞
 | |
| Johnny's Mother (uncredited) | Olive Carey | |
| Scientist (uncredited) | Harry Carter | |
| Bit Boy (uncredited) | Ronnie Clark | |
| Policeman (uncredited) | Russ Clark | |
| The House Painter (uncredited) | Heinie Conklin | |
| Mr. Peabody Auto Salesman (uncredited) | George Eldredge | |
| Mrs. Brannigan Neighbor (uncredited) | Kathleen Freeman
 | |
| Bit Boy (uncredited) | Terry Goodman | |
| Cab Driver (uncredited) | Dabbs Greer | |
| Man In Opening Credits (voice) (uncredited) | 霍华德·霍克斯
 | |
| Oxley Receptionist (uncredited) | Marjorie Holiday | |
| Bit Boy (uncredited) | Rudy Lee | |
| Bit Boy (uncredited) | Louis Lettieri | |
