WARNING: The following contains spoilers for X-Men #9 by Jonathan Hickman, Leinil Francis Yu, Sunny Gho, VC's Clayton Cowles and Tom Muller, on sale now
The Marvel Universe is full of alien races and cosmic empires that have been turned against one another across their centuries of existence. Even if their entire histories didn't unfurl in front of readers, all of these alien races have deep ties or rivalries to each other.
And now, X-Men #9 just revealed that the Brood, one of the oldest and most dangerous species in the galaxy could have been contained. However, the Kree Empire decided against it. With full knowledge of how dangerous the Brood really were, they began grooming the invasive alien race to be the perfect weapon via the Brood King Egg.
THE BIRTH OF THE BROOD
The opening pages of X-Men #9 focused on events that happened thousands of years before the modern Marvel Universe. On the Kree capital world of Hala, an accuser confronts a pair of scientists about their discoveries. IThe pair are 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.
This could theoretically give the Kree a major advantage in any open conflict with another empire. 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 Shi'Ar. This seems to be the chief reason why the Brood have always targeted the Shi'Ar space and been such a problem for them and their sometimes-allies the X-Men, which means the Kree are responsible for a lot of destruction.
It's even revealed that the Brood aren't the only species that the Kree experimented on and considered as biological weapons. Others include the Sidri, which just reappeared in Giant-Size X-Men: Nightcrawler and the Phalanx, but neither of them was considered the success that weaponizing the Brood could become. Although the Kree aren't sure of the actual origins of the species, there are suspicions that the species may have been manufactured at one point. This means that at the very least the Kree long-predicted the destructive capability of the Brood and, instead of trying to contain or stop them, fostered their own means of control and held onto it for thousands of years.
Considering how the Brood have spread out across the cosmos and done incredible damage, the blood of countless species is on Kree hands. The attempts of the Accusers to recover the King Egg may, in turn, reveal the truth about the full extent of the Kree's involvement in the survival and spread of the Brood. This could even turn the Shi'Ar against the Empire in revenge for the crimes committed long ago. They could even have the most poetic justice possible if the Shi'Ar were to try and request that the X-Men (which includes Broo, the newly crowned Brood King) send the hordes of monsters after the Kree as revenge. With the Kree and Skrull finally united in the upcoming Empyre storyline, the possibility of the Brood finally coming back to the haunt the Kree couldn't have come at a better time.
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