| CAST | CONNECTIONS | |
|---|---|---|
| Johnny Downs | Tom Gregory | |
| George Zucco | Dr. Lorenzo Cameron | |
| Anne Nagel | Lenora Cameron | |
| Glenn Strange | Petro | |
| Sarah Padden | Grandmother | |
| Gordon De Main | Prof. Fitzgerald | |
| Mae Busch | Susan | |
| Reginald Barlow | Prof. Warwick | |
| Robert Strange | Prof. Blaine | |
| Henry Hall | Country Doctor | |
| Ed Cassidy | Father | |
| Eddie Holden | Jed Harper | |
| John Elliott | Prof. Hatfield | |
| Slim Whitaker | Officer Dugan | |
| Gil Patric | Detective Lieutenant | |