The Uprising Begins
This all started thousands of years ago when the Prince of the Makluan Empire stole his fathers rings and fled to earth because he disapproved of his farther using the power the rings gave him the power to conquer and destroy entire planets. Upon arriving the Prince crashed his ship and was saved by the original Mandarin the two later became friends and the Prince eventually gave the Mandarin the Makluan rings and the dragon seed which is essentially Makluan DNA giving the Mandarin the power to use the rings. The dragon seed is inherited by all of the Mandarins descendants but he spreads the rings all around the earth because he did not believe any of his sons to be worthy of the power eventually one of his descendants found all ten Makluan rings and unintentionally activated a locator beacon inside the rings which had been shot of by the Prince of the Makluan Empire so the Makluan invaded earth to find the rings and when they did take them back. They decided to continue there tradition of conquest and destruction. All the earths heroes and there villeins realized the threat they posed to the earth and banded together to stop them and the Avengers even reprogrammed Ultron the robot guard they created to watch over a prison made specifically for the worlds super villains but they failed now the Avengers, the justice league, the fantastic four, the Doom Patrol, Teen Titans and all of there former enemies are dead but before they dead, Ultron had been reprogrammed to serve the Makluan Empire and to keep us in line well now with the world under control of the Makluan Empire all humanity has to make a choice to fight or serve the Empire.
Ok basically as you can tell both villains and heroes have been competently wiped out and humanity's only hope is if new generation heroes raise up and save the world now like i said everyone has a choice fight or serve the Makluan who have enslaved the human race and anyone with powers that they find are ever killed or end up working for them so our characters will either be super powered people who have been captured and recruited or who have been able to stay hidden and have finally decided enough is enough. They will risk their lives and stand up and fight for their home for freedom. For their family/friends or for their very survival regardless of motive they will have to work together to have any chance at victory