Great start, and while it took me a second to recognize the reference, I'm glad you're using Power Pack as well. One of the few series I have all of, and as many subsequent specials as possible (so I've seen Julie evolve into the teenager with the crop top version of her Lightspeed outfit in Runaways), as well as Alex in New Warriors. Given the timeframe, would this be during the original Pack series, though, or just after? (Since they flipped powers, you could do Julie with the mass power to be different :) ) I look forward to more, along with the rest of your stories.
Author's response
I used the Pack because (a I like the Pack and (b they were the only pre-teen heroes running around at the time (excepting Alex of course) Julie would have been 12 just as their first series ended, so that's what I'm using... Not that the Powers will be making all that many appearances as Julie's main role is 'the girl he left behind' and a source of jealousy for Hermione and Padma...