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Mary Jane is the best friend of Penelope Parker. While on a school trip to Osborn Labs to learn about radioactivity, MJ played a prank on Penelope by taking her notepad and tossing it in the air. As she scrambled for it a radioactive spider landed on Penelope's hand and bit her. MJ grabbed the spider and threw it on the ground while Flash killed it by stepping on it.[1]



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