Champions 3-D (4th Edition)

What if the Roman Empire had never fallen? What if dinosaurs had evolved into intelligent beings? What if Doctor Destroyer ruled the world? Create alternate dimensions, also called parallel worlds, which are separate universes overlapping our own, universes where history took another path. What does this have to do with your campaign? Why does this affect your campaign world? Because in comic books, heroes can travel between the dimensions. Dimensional travel allows the GM to give his players new challenges, new enemies, and new opportunities for roleplaying, without having to make permanent changes to your campaign.