The Kree are one of the Fantastic Four's oldest enemies; the Shi'ar, one of the X-Men's oldest allies. But it's the Avengers who are caught in the middle when the two alien races wage a war to re-write Marvel's map of the universe! As two-legged WMDs land on Earth, the Avengers end up as alien invaders on wartorn worlds of wonder, both as a unit and individually! Featuring the Imperial Guard! Starforce! Deathbird! Thor vs. Gladiator! Super heroes from three galaxies and more clash in the first half of the story that shook the team to its foundations!