I can't believe I never suggested:
Portal Corporation (from
City of Heroes, even thought we're running a
City of Heroes game). Link to the Paragon Wiki article which breaks it down.
Basically, Homeline's worst nightmare: do-gooder superheroes with unrestricted access to the multiverse. And, due to the incarnate-source of their powers, their powers seem to work fine in every universe they visit. Could be worse--oh, wait, it
is as the villains from the Rogue Isles have access as well!
Unlocked from a side-effect of a drug that allowed some of its users to see/access other dimensions. The drug manufacturer was
actually researching the dimensional affect of the drug, not trying to start a war.