Did a bunch of searches, but couldn't find anything that matched what I'm asking.
Anyway, what attempts, if any, have been made to do a Team vs Team battle? Imagine it as a sort of Danger Room training exercise where heroes are divided up into two teams of three or four heroes. No villain. The Danger Room can be one of the environments.
Is such a thing even possible? Or is it broken from the get-go based on how the hero mechanics function?