While trying to carry out the job of taking down a Teuthidan squadron stationed on Earth, Gwenpool murdered another mercenary that had completed said mission and took credit for his work. In order to find a stable source of income, Gwen decided to become a mercenary, getting contract jobs from the tailor Ronnie. Gwen rectified her misdeed by infiltrating into a Hydra facility and getting rid of the virus with Howard's help. When Gwenpool attempted to kill Howard the Duck, who had been coerced by the Black Cat into finding the thief, he made Gwen see the error in her nonchalant attitude, which originated from Gwen undervaluing the lives of the inhabitants of the Marvel Universe, whom she believed were nothing more than fictional characters. Gwenpool's first misadventure involved stealing a virus from the Black Cat and selling it to Hydra for quick cash, believing that the Avengers would deal with any sort of consequence.

The tailor Ronnie complied, but she also misread Gwen's form, and thought the young girl went by the alias of 'Gwenpool.' Unwilling to being relegated as an 'extra,' Gwen went to Big Ronnie's Custom Battle Spandex and requested her own costume to stand out. However, both became separated on arrival, and believed the other hadn't survived the transition. Through unrevealed means, Gwen and her brother Teddy ended up in the Prime Marvel Universe. Gwen's difficulty to find a job after having been unable to graduate from high school, combined with the fact all of her friends moved away, led her to submerge in fiction in order to escape from her reality and fantasize about a better world, becoming lazy and apathetic, to the chagrin of her parents.

Gwen Poole originally lived in a universe not unlike ours, a place where all superheroes and supervillains were fictional characters that manifested through comic books, movies, and other media.

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