- When an entire planet, and potentially the entire galaxy, is caught in the crosshairs of Knife's cosmically empowered forces, the Guardians and the X-Men face their final test. - With billions of lives at stake, our heroes are forced to make the ultimate sacrifice. - But in gaining the power to potentially defeat Knife, by submitting to the Black Vortex, could they have given up their humanity forever?

- When an entire planet, and potentially the entire galaxy, is caught in the crosshairs of Knife's cosmically empowered forces, the Guardians and the X-Men face their final test. - With billions of lives at stake, our heroes are forced to make the ultimate sacrifice. - But in gaining the power to potentially defeat Knife, by submitting to the Black Vortex, could they have given up their humanity forever?