Uuuuuhhhh...wHAAaaaaaaaaaaAAT?
Carol was supposed to have been kidnapped and used as a womb by the Skrulls to create their own tentacle head living super computer leader, ala the Kree Supreme Intelligence. But another comic had done a similar story with a baby version of the Kree Supreme Intelligence, so Shooter veoted the storyline and forced the Avengers writers to reveal Kang's son Marcus (trapped in Limbo due to sorcerery) grabbed Carol, hypnotized her into having sex with him, so he could impregnate her with himself via witchcraft, then have her give birth to him on Earth to skirt the spell on him.
Unfortunately the spell fought back and time started breaking down, and Marcus (rapidly aging to adulthood) had to go back to Limbo to restore Earth to normal. Carol went with Marcus, because she still found him hot and the Avengers didn't do much to try and stop her.
This created a huge backlash, as fans didn't like that Carol ran off with her rapist. Also, Shooter used this to get rid of Carol's solo book (which had sold poorly, but had just hired X-Men writer Chris Claremont. Claremont was super pissed, not just for Carol running off with her rapist, but the fact that Shooter killed Carol's book, just as Claremont was planning to tie it into the X-Men book, via a major arc where Carol would infiltrate the Hellfire Club, along with introducing Mystique and her new Brotherhood of Evil Mutants. Mystique and the Brotherhood got incorporated into the X-Men (though with some changes; Rogue became Mystique's adopted daughter while Nightcrawler Mystique's biological son),
The backlash made the early fan press scene and create enough bedlam, that Claremont was given the following year's Avengers Annual to "fix" it: granted, the solution made more problems (Claremont depowering Carol to prop up Rogue as a new big bad, which he promptly abandoned out of the blue in favor of making Rogue a good girl nearly three years later let alone the fact that Rogue's power stealing gimmick only permanently stole Carol's and not the rest of the Avengers was considered hackery). The ending of the issue, had Carol (her memories haphazardly restored by Xavier) be reunited with the Avengers, at which point Claremont "addressed Avengers #200 and Carol being raped. Claremont retconned that Carol was still under Marcus's mental control the entire time she was pregnant with him and after he gave birth. As such, when Carol left with Marcus, she was still his thrall and he effectively made her go with him against his will.
This leads to the final "twist" of sorts, to Claremont making a bad situation worse, as Claremont then promptly killed Marucs off off-page. The curse that kept him stuck in Limbo and forced him back there, killed him dead by accelerating his aging to the point he died and turned to dust. Once he was dead, Carol was freed from his mental control and was super super pissed off that the Avengers didn't once question if she was still Marcus's thrall when he took her away with him to Limbo. Which removed Marcus the Rapist as a future enemy for Carol to fight.
Busiek (who made Carol an alcoholic as a metaphor for the unresolved trauma of having her soul sucked out of her by Rogue, since by this point Rogue and Mystique were too popular to turn evil again so Carol could kill her for closure) quasi-addressed the issue again in his Avengers run. In his last storyline, he had the reveal that Kang kept cloning his son Marcus (and gave the latest clone, who had never met Carol before, his old Scarlet Centurion armor) and one of the clones tagged along in Kang's latest gambit to conquer Earth. Carol was disturbed to see Marcus again, let alone that she wanted to fuck him. Marcus eventually betrayed Kang to help Carol destroy a key component of Kang's scheme, then found out the entire caper was supposed to be Kang's last hurrah before turning his empire over to Marcus. Marcus however, being a daddy's boy, refused to let Kang (upon defeat) stay in prison and rescued him. At which point, Kang revealed that he knew Marcus betrayed him but was willing to forgive him so long as he took over Kang's empire and let his dad die in a blaze of glory. Kang stabbed his son to death and resumed control over his empire.
