Hi, I'm new here.
I've read variations of the theme here, but I don't think they anybody has come with this exact scenario so far (sorry if I'm wrong): so, anyway, Mr. Majestic, Apollo (classic Authority, pre-New 52), Supreme (Alan Moore's) and Omni-Man vs. the Sentry (no Void), Blue Marvel, Gladiator and Hyperion (Supreme Power). All participants in character. No previous knowledge of their rivals, no prep time. Wins by defeating, incapacitating or killing the members of the other team. The fight takes place in the Negative Zone.