Marvel Comics

The fourth Avengers omnibus continues Roy Thomas's era into the period of the legendary Avengers-Defenders War — the first major inter-title crossover in Marvel history, where the two teams were manipulated into fighting each other by Loki and Dormammu across eight issues spanning both books. The crossover established the template for Marvel's event publishing model and proved that interconnected storytelling across separate titles could work as a commercial and narrative strategy.