Justice League Quarterly #9 (Winter, 1992)

So this is your basic temporal paradox. Booster Gold meets a homeless kid who he recognizes as a huge celebrity and Samaritan from his past in the far future. She died tragically in the 21st Century, so Booster helps her avoid an unscrupulous Hollywood type and reunite with her family. Her twin sister survives what was once an early death, and together they forge a brighter future. As a result, Booster mostly forgets both the runaway and her erased infamous fate.

That wasn't the temporal paradox that I was referring to, though.

The girl shines up real good for someone previously routinely mistaken for a boy, blossoming like a made-over nerd in a teen comedy. Everyone's jaw is on the floor when she *gasp* applies make-up and raids Fire's closet. Booster. Max. Beetle. Bloodwynd... who even requests an introduction. "Geralyn, this is J'Onn... Ted... Max. Send them your autograph--"

This story came out roughly the same month as Justice League America #69, the Doomsday tie-in where Blue Beetle is beaten into a coma right before seeing Bloodwynd transform into someone else while exposed to flames. Five months before Justice League America #74, where that form was revealed to be the Martian Manhunter. Maybe it was an accident, or at least written off as one, but Booster still outed Bloodwynd as J'Onn J'Onzz way ahead of it being anything but a Feudian slip...

"Tomorrow Belongs to Geralyn" was by Elliot S. Maggin, Dave Cockrum, & Jose F. Marzan, Jr. Quite the hoary lot in the '90s, and this was Cockrum's second story in the issue, so I'm sure the little fanboys were just thrilled.