While the main Secret Wars series focused on the attempts of the last survivors of the original reality to rally the populace against Doom and find a way to restore everything, many of the tie-ins delved into these sectors.
Each of these worlds became 'domains' that remained under his control, full of unique variants of classic characters that could run into one another due to the shared nature of Battleworld. Secret Wars saw various realities from across the Marvel multiverse - which had been increasingly wiped out by waves of destruction caused by the Incursions - cobbled together into a new Battleworld by the godly empowered Emperor Doom.
