Student Peter Parker is bitten by a spider while witnessing an experiment in radiology. He discovers that the radiation has transferred the properties of the spider to him, granting him super spider powers. Preoccupied with their possibilities, Peter fails to help the police stop a thief. Later he learns that his house was robbed and his uncle Ben was murdered. Furious, Peter tracks down the culprit at a warehouse, and, on seeing the man's face, realizes that it was the Thhief he let escaped before. From that day forward, Peter vows to use his new powers to fight crime, as Spider-Man.