Marvel Comics

The third Avengers omnibus covers Roy Thomas's tenure including the landmark Kree-Skrull War — the first major Marvel cosmic event, a war between two galactic empires that drew the Avengers into space opera territory years before the concept became Marvel's standard mode. Neal Adams and John Buscema provided the artwork for this era's most ambitious stories, and Thomas demonstrated that the Avengers format could sustain multi-issue epic storytelling without losing character focus.