Earth-7412 is a possible future that is currently in its 23rd century. It came into existence when the possible futures of Earth-715 --named Femizonia for its female dominant society-- and Earth-74101 --called Machus for its male dominant society -- were in the process of merging due to some unseen force.
The crossing over of these two alternate futures caused the men of Femizonia to rebel against their rulers. Seeking to put the rebelling men back in their place, the rulers of Femizonia determined that the inciting factor causing this reality merger was caused by an event that occurred in the modern era of Earth-616. They sent their greatest warrior Thundra to that era to defeat a man that was arguably the world's strongest. Her search brought her to the conclusion that this man was the Fantastic Four's strong men, the Thing. Thundra made it her mission to utterly defeat the Thing, convinced that this would halt the merging of Femizonia and Machus. 
Try as she might, outside factors prevented Thundra from carrying out her task and she grew a grudging respect for the Thing as her opinion of men slowly changed.  Eventually, Mahkizmo, ruler of Machus, traveled back in time to the modern age to stop Thundra on her mission. By this point she sought the aid of the Fantastic Four, but found herself captured and brought to Machus. The Fantastic Four followed after her with their time machine, but most of the team was captured.  Medusa managed to escape to Femizonia where she recruited an army to attack Machus. With the rest of the Fantastic Four and Thundra free, a massive battle broke out. In the ensuing chaos, both the Thing and Thundra struck Mahkizmo as he reached critical mass. The resulting explosion, seemingly atomized Machizmo and finalized the merger between Femizonia and Machus. But instead of finding two genders at war with each other, both came to embrace one another. The merging of the two realities also shunted the Fantastic Four and Thundra back to the modern era of Earth-616. .
Mahkizmo survived this encounter and eventually reconstituted his body. Not liking this peaceful world, he created a Gender Bomb to wipe out all women in the past and ventured back in time to set it off.  Taking a page from Thundra, he also sought to defeat the She-Hulk in battle, but interference from the Olympian god known as Eros saw Mahkizmo fall in love with She-Hulk and he fled with her back to Earth-7412.  Following her were the Thing and her then-boyfriend Wyatt Wingfoot. While She-Hulk explained to Mahkizmo how foolhardy his plan was, the men and women of this new reality suddenly remembered their distinct worlds thanks to the presence of the time travelers from Earth-616. This caused feuding between men and women, but now both recognized each other as equals in that they were both classes of warriors, restoring something of a natural order.  The current status of Earth-7412 is unknown.