Virtually nothing is known about Earth-15, and what can be learned of it comes from its only recorded occupant, Peter Parker. At some point in his life, this reality's Parker bonded with an alien symbiote and became the notorious mass-murderer known simply as "Spider". Whether or not he had gained super-human powers or was a criminal prior to this remains unknown.

He was one of the many heroes chosen by the Timebreakers to become a member of the reality hopping Weapon X team to fix damaged realities. Ultimately, Spider was slain during the liquidation of excess members of Weapon X and its sister team, the Exiles. Much later, his body was returned to his native reality where it was buried in a prison cemetery.

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