O Monstro do Ártico
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Kenneth TobeyCaptain Patrick Hendry
Margaret SheridanNikki
Robert CornthwaiteDr. Arthur Carrington
Douglas SpencerNed 'Scotty' Scott
James YoungLt. Eddie Dykes
Dewey MartinCrew Chief Bob
Robert NicholsLt. Ken 'Mac' Erickson- William SelfCorporal Barnes
- Nicholas ByronTex Richards
Eduard FranzDr. Stern- George FennemanDr. Redding
Paul FreesProf. Voorhees
Everett GlassProf. Wilson
Norbert SchillerDr. Lorenz
Edmund BreonProf. Ambrose
John DierkesDr. Chapman- Sally CreightonMrs. Chapman
James Arness'The Thing'
David McMahonGen. Fogarty- Bill NeffBill Stone (sem créditos)