Dr. Karla Sofen, a.k.a. the villainess Moonstone, began her tenure as Ms. Marvel in issue #38 after Carol Danvers refused to follow Norman Osborn's Dark Avenger team. And boy did the good evil Doc wear the original costume well! As any fan might have predicted, it was only a matter of time before Danvers returned to reclaim her mantle in the "War of the Marvels" story. The event spanned Ms. Marvel #41-46 but you could go back as early as issue #39 to see the seeds planted for Carol's return.