The story begins with Clark Kent and Lois Lane, along with the entire town, observing a scientist's (who resembles Captain Marvel's archnemesis Dr. Sivana ) demonstration of his magnetic telescope. A giant, u-shaped magnet connected to the telescope is pointed at a comet and turned on, drawing the comet towards the observers. Something goes wrong, however, and the comet crashes into the town, rolls through the streets, and then tumbles into the ocean nearby.
Newspapers the next day report the disaster, and the police are shown arguing with the scientist, who claims the importance of his work is worth the risk of human lives. The police say, as Lois looks on, that they will stop any attempt to try the experiment again, but the scientist refuses to quit, reminding them that any attempt to stop him could prove disastrous. He runs into his telescope room and shuts the door before the police can stop him, and begins his experiment again. Just as the magnet pulls the comet into earth's gravitational pull, the police jam a piece of metal into the electric generator running his machine and cut its main wires with axes. The comet, now out of the scientist's control, hurtles towards the town in a bright circle of light.
As the police and scientist flee, Lois calls the Daily Planet from the scientist's building, reporting the impending disaster as the building crumbles around her and pins her. Clark happens to be standing nearby, and takes a cab to get to the telescope. As he nears the building, pieces of the comet destroy the road in front of them, the cabby flees, and Clark takes the opportunity to change clothes in the back of the car, becoming Superman.
Superman saves Lois from the rubble of comet-shards, and then streaks towards the hurtling comet, striking it full-force, but he bounces off, seemingly having no effect on the comet's speed at all. While Superman lies unconscious, more comet-shards crush buildings, cars and trains across the town. Superman awakes and flies at the comet again, only to bounce off again, falling into the telescope's generator room. He notices the metal bar in it and removes it, then winds some cable around its rod and pulls, sending the generator into motion. He then completes the circuit to the scope by grabbing both ends of the cut wire and allowing the electric current to run through his chest from arm to arm. Lois sets the machine to reverse, and the comet is sent back into space just in time. We then see "Superman's" silhouette in the telescope control room, and Lois kisses him, only to find out that it is Clark.
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