From what I've noticed, whenever Marvel comes up with something that doesn't necessarily fit in their continuity (i.e. Quasar), they simply ignore it, never bring it up again, and hope the fans don't ask questions. As I understand it, it's worked pretty well. For example (for those of you who haven't read Daredevil: Visionaries by Kevin Smith, stop here - SPOILERS AHEAD!) Kevin Smith killed a lot of people during his run on Daredevil, like Karen Page and Mysterio. However, I know for a fact that Mysterio, even after his death, reappeared in the pages of Spider-Man without any rhyme or reason. Did people notice? I did. Did Marvel try to fix it by making him someone totally different? No. They just ignored it and hoped it would go away...
