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Monster Spider is a creature that Peter Parker transformed into which is very similar to his Man-Spider mutation.
Caught in a radiation blast while saving a group of scientists Spider-Man began to mutate uncontrollably. Transforming into a creature more spider then man, unable to stop the mutation, Spider-Man went to Mister Fantastic of the Fantastic Four for help. To cure Spider-Man, Mister Fantastic started Monster Spider on radiation treatments. However, Monster Spider escaped and the Fantastic Four had to hunt him down. The Fantastic Four was able to capture Monster Spider. Mister Fantastic was then able to cure Spider-Man.
Monster Spider can climb walls, has super strength and agility, spider sense, and can shoot webs from his body.