Annihilation, Book 1 (Marvel Comics) (Bk. 1)
I really like this story. Generally, with cosmic SF stories, I prefer it when they really give the universe a sense of scope, as opposed to putting more of the focus on the heroes and letting the ancillary characters fade to the background - this is one of the things that has really worked with Green Lantern ever since Dave Gibbons run on the books.