Astro City: Through Open Doors

"Kurt Busiek and Brent Anderson launch their next epic in the world of Astro City when a mysterious door appears, heralding the arrival of the Ambassador. But when an ordinary man is caught in a cosmic conflict, it is up to favorites like Samaritan and Honor Guard, as well as new heroes, to rise to the occasion and save the world! Astro City #1-6"--