As Thor walks through the city, he is jeered at by bypassers who call the police. Thor is unaware that he has been implicated in a bank robbery. As the police fire on him, Thor decides the safest thing to do is to became Dr Don Blake for a time. He recalls how his father Odin has forbidden him to marry the mortal woman Jane Foster, so he decides to ask Odin to make her immortal instead.
As Blake takes Jane out to dinner, they are interrupted by the villain Mister Hyde, who takes them prisoner at gun point. He leaves Blake tied next to bomb, threatening Jane that he will kill Blake if she resist him. Heading to the East River Naval Yard, Hyde steals a Polaris submarine.

The bound Dr Blake finally manages to reach his cane, and transform into Thor. Odin watches from Asgard as Thor engages Hyde in battle. When drops his hammer for a moment, Jane conceals it - fearful that if Hyde is defeated, he will be unable to keep Blake from being blown up.

Without his hammer, in 60 seconds Thor will return to his Blake form. So the Thunder God uses his cape to create a tornado within the sub the conceals his transformation back to Blake and allows him to find the hammer. By the time he can transform back to Thor, Hyde has used the tornado as cover to escape. Before Thor can go searching for him, Jane informs him that Dr Blake is in danger. Thor has to pretend to go rescue his alter ego to keep Jane for learning his secret.
Suddenly Odin appears and angrily informs Thor that he will not make Jane immortal. Her actions in hiding the hammer and allowing the evil Hyde to escape showed that she was unworthy. Thor laments that he may never find happiness.

---