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Adapted from "Trapped by Loki, the God of Mischief!" from Journey Into Mystery #85 and "The Vengeance of Loki!" from Journey Into Mystery #88.
Adapted from "The Icy Fingers of Jack Frost!" in Tales of Suspense #45, September 1963
The events in the Origin of Captain America 3 parter are based on events in the Marvel comic Tales of Suspense issue 63 and 64.