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Gohan VS Doomsday is a follow-up to Goku VS Lex Luthor but instead of Goku fighting one of Superman's villains it's Goku

Darth Vader VS Bowser is a battle of iconic villains who lead dark army's

Superman VS Spider-Man is a battle i made because of one of the biggest complaints of Batman VS Spider-Man which is "But Batman beat Superman" and since Spider-Man killed Batman can he beat Superman?

Batman VS Green Goblin is because as Batman fought Spider-Man but how will he do against his main villain?

Also here's the link to Bizarro vs. Cell so you can find out there common points.