Shelley's PRIMUS e-book brought in the PRIME team, a group of supers. They were pretty tightly tied into a plot line, but not so tight they couldn't be "cut free" and used simply as supers who chose to join PRIMUS. I've never used them (too many game ideas, not enough game time), but if I did I'd dump the "secret history" and run them as supers with a government paycheck.