O Monstro Elétrico
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Lon Chaney Jr.Dan McCormick
Lionel AtwillDr. Paul Rigas
Anne NagelJune Lawrence
Frank AlbertsonMark Adams
Samuel S. HindsDr. John Lawrence
William B. DavidsonDistrict Attorney Ralph B. Stanley
Ben TaggartDetective Sergeant Regan
Constance BergenNurse
Ivan MillerDoctor
Chester GanChinese Boy, Wong
George MeaderDr. Bruno
Frank O'ConnorDetective
John DilsonMedical Examiner
Byron FoulgerAlienist #2
Jessie ArnoldMrs. Frank Davis (sem créditos)
James BlaineCharlie, Prison Guard (sem créditos)- Gary BrecknerRadio Announcer (sem créditos)
- Lowell DrewJury Foreman (sem créditos)
- John EllisAssistant District Attorney (sem créditos)
- Douglas EvansPolice Radio Announcer (sem créditos)
- Jack GardnerReporter (sem créditos)
William HallMike - Dynamo Operator (sem créditos)
Russell HicksWarden Harris (sem créditos)- Wright KramerJudge (sem créditos)
- Tom QuinnDetective (sem créditos)
Bob ReevesPrison Guard (sem créditos)- Mel RuickDefense Attorney (sem créditos)
- Francis SaylesFrank Davis (sem créditos)
- Paul ScottPrison Chaplain (sem créditos)
David SharpeHay Wagon Passenger (sem créditos)- Victor ZimmermanDynamo Operator #2 (sem créditos)
- CorkyCorky the Dog (sem créditos)