Collects Secret Wars #1-9, Free Comic Book Day 2015 Secret Wars #0 (Secret Wars story).

The Marvel Universe is no more! The interdimensional Incursions have eliminated each and every alternate universe one by one. And now — despite the best efforts of the scientists, sages and superhumans — the Marvel Universe and Ultimate Universe have collided...and been destroyed! All that exists in the vast empty cosmos is a single, titanic patchwork planet made of the fragmented remains of hundreds of devastated dimensions: Battleworld! And the survivors of this multiversal catastrophe all bend their knee to Battleworld's master: Doctor Doom! What strange creatures inhabit this world? Which familiar faces will return? And what happens when Battleworld's various domains go to war? The Marvel Universe is dead — and the victors of the Secret Wars will determine what comes next!