Free Comic Book Day 2009 Avengers #1

Thor dominates the center of Jim Cheung's sweeping cover, Mjolnir crackling with lightning in his grip, while an impressive roster surrounds him — Wolverine's claws are out, Spider-Man lunges forward, Captain America stands resolute, and figures including Spider-Woman, a black-suited hero, and several others fill every corner of the composition. Released as a Free Comic Book Day 2009 giveaway, this issue from Brian Michael Bendis offers a great entry point into the Avengers' world at no cost whatsoever. It's a generous, visually packed sampler that captures the sheer scale and energy of Marvel's premier super-team.