 Evalyn KnappPauline Hargrave | Pauline Hargrave |
 Craig ReynoldsRobert Ward (as Robert Allen) | Robert Ward (as Robert Allen) |
 James DurkinProf. Hargrave | Prof. Hargrave |
 John DavidsonDr. Bashan | Dr. Bashan |
| SSonny RayWillie Dodge | Willie Dodge |
 Frank LackteenFang | Fang |
 Pat O'MalleyTim Sullivan | Tim Sullivan |
 William DesmondProf. Thompson | Prof. Thompson |
 Josef SwickardHaggins, Foreign Consul | Haggins, Foreign Consul |
 William WorthingtonAmerican Consul | American Consul |
 Adolph MilarCapt. Drake | Capt. Drake |
| JJames WangFoo Chow, Bashan's Henchman | Foo Chow, Bashan's Henchman |
 Don BrodieAirline Official | Airline Official |
 Wong ChungChinese Man | Chinese Man |
| GGeorge DeNormandNew York Henchman | New York Henchman |
| BBeulah HuttonWoman Accomplice in Singapore | Woman Accomplice in Singapore |
 Al KikumeBashan's Attendant | Bashan's Attendant |
 Ethan LaidlawFake Museum Watchman | Fake Museum Watchman |
 Tom LondonSoldier at American Consulate | Soldier at American Consulate |
| MMerrill McCormickGuide-Henchman | Guide-Henchman |
 Monte MontaguePolice Guard | Police Guard |
 Jack MowerAirport Inspector | Airport Inspector |
 Constantine RomanoffTyrone | Tyrone |
 Churchill RossAmerican Tourist | American Tourist |
| DDick RushCop at Fire Scene | Cop at Fire Scene |
 Philip SleemanHenchman | Henchman |
 Charles StevensLee | Lee |
| EEmma TanseyAmerican Tourist | American Tourist |
 Ruth WarrenStewardess | Stewardess |