In addition to his mainstream incarnation, the Punisher has also been depicted in other fictional universes, in which the character's history, circumstances, and behavior vary from the mainstream setting. In some stories, another character besides Frank Castle serves as the Punisher.
The Marvel 2099 universe follows the story of Public Eye police officer, Jake Gallows, after the murder of his mother, brother and sister-in-law. Gallows comes across Frank Castle's war journal in the Public Eye archives, and took the mantle as the new Punisher. At first he follows Frank's old code of justice, only killing those who hurt the innocent. He later loses his mind, at one point proposing murdering two people simply because they were having sex with each other. He is named Ministry of Punishment in the Doctor Doom's 2099 government. He is joined by Polly, a lab-bred humanoid who becomes his partner.
Alternative versions of the Punisher have appeared for over three decades. The earliest examples of those alternative versions can be found within the monthly What If series. Using existing Marvel stories as a starting point, the series examined scenarios in which, for example, Frank Castle's family has not died or he had killed Daredevil in their first encounter. Other "what if" stories looked at his adventures as a new Captain America or as an agent of S.H.I.E.L.D. Garth Ennis wrote a one-off special entitled Punisher Kills the Marvel Universe where Frank Castle kills every superhero and supervillain in the Marvel Universe.
The Punisher also featured in a number of more extended looks at alternative universes and lives such as the Age of Apocalypse's Frank Castle (as a man who fled genocide to become a monk).
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