Thousands of years before the modern Marvel Universe, its revealed the Kree had captured some Brood's species and experimented on them as they considered the specie could be used as a biological weapon. Eventually an accuser confronts a pair of scientists about their discoveries from researching the Brood, who have started to show signs of the advanced adaptation that they'd become intergalactically feared for centuries later. The Kree scientists explain that they want to continue to foster the Brood race and even figure out how to instill a patriarchal element that could turn the entire Brood species into a controllable army by creating the King Egg. By deploying the King Egg, they'd be able to take complete control of the entire Brood species. The Supreme Intelligence sees the creation as a compelling potential weapon but decides that it should be tested on another empire to chart the effectiveness of the species as a weapon. The Supreme Intelligence specifically guesses that it'll take thousands of years to create a large enough army to fully be unleashed as a weapon. However, it adds that they would then make a perfect tool to unleash against someone like the Shi'ar.