The two comic universes came together when the two physical incarnations of their respective universes (referred to as "the Brothers") became aware of each other after eons of slumber. To prevent the Brothers from destroying each other, characters from each universe battled to determine which universe would survive (a real world vote by readers of the series was conducted to determine the outcome of five of the in-comic matchups, with three of them favoring the Marvel hero). Access, a character created for the event and co-owned by Marvel and DC, served as a gate keeper who became stuck while traveling between the two universes.