| Matthew Bennell | 唐纳德·萨瑟兰
 | |
| Elizabeth Driscoll | 布鲁克·亚当斯
 | |
| Jack Bellicec | 杰夫·高布伦
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| Nancy Bellicec | 维罗尼卡·卡维特
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| Dr. David Kibner | 伦纳德·尼莫伊
 | |
| Dr. Geoffrey Howell DDS | Art Hindle | |
| Katherine Hendley | 莱丽亚·古多尼
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| Dr. Miles J. Bennell | 凯文·麦卡锡
 | |
| Taxi Driver | 唐·希格尔
 | |
| Ted Hendley | 汤姆·拉迪
 | |
| Stan | Stan Ritchie | |
| Mr. Gianni | David Fisher | |
| Detective | Tom Dahlgren | |
| Dr. Boccardo | Garry Goodrow | |
| Restaurant Owner | Jerry Walter | |
| Chef | Maurice Argent | |
| Street Barker | Sam Conti | |
| Mr. Tong | Wood Moy | |
| Mrs. Tong | R. Wong | |
| Outraged Woman | Rose Kaufman | |
| Harry | Joe Bellan | |
| Policeman #1 | Sam Hiona | |
| Policeman #2 | Lee McVeigh | |
| Rodent Man (as Albert Nalbandian) | Al Nalbandian | |
| Schoolteacher | Lee Mines | |
| Harry's Boxer Dog | Misty | |
| Health Dept. Floor Cleaner (uncredited) | 迈克尔·查普曼
 | |
| Priest on Swing (uncredited) | 罗伯特·杜瓦尔
 | |
| City Official on Phone (voice) (uncredited) | 菲利普·考夫曼
 | |
| PG&E Man (uncredited) | Al Perez | |
