*As told in: Avengers (Vol 1) #345-347, Avengers West Coast #80-82, Captain America (Vol 1) #398-400, Quasar #32-34, Wonder Man #7-9, Thor (Vol 1) #445-446, Iron Man (Vol 1) #278-279.
When the militaristic Kree empire went to war with the star-spanning Shi'ar empire, the Earth found itself caught in the crossfire! The Avengers, Earth's mightiest heroes, journeyed to the opponents' home star systems in the hope of stopping the war. But, ultimately, it was the accidental detonation of the cosmically powered Nega-bomb that brought an end to the conflict - and the incident turned both alien societies into vengeful enemies of the Avengers and the Earth! *Source: Back of Card