NASA invites both Peter and Sally-Ann Beaumont from Empire State University to witness the landing of their Mars probe, Explorer One at an island location. The probe, containing radioactive soil samples, lands on target. However, the Sandman, who was hiding in the surrounding sand, steals the soil sample and intends to absorb it into his body, with the radiation contained in it making him more powerful. Spidey does battle with him, but is unable to prevent the Sandman from absorbing the Martian soil. Unfortunately, as a result of donning his Spider-Man costume, Peter is then accused of negligence by Sally-Ann, after he was nowhere to be seen during the Sandman's fight, and faces dismissal from the college. Meanwhile, the Sandman begins a crime spree by stealing money from the First City Bank. With his new radioactive powers, the police and Spider-Man are helpless to stop him. Spidey ends up in the position of having to exonerate himself in front of the school board, shut his closet door before Aunt May discovers his spare spider-suits, and stop the radioactive-powered Sandman.
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