Asgard. Alfheim. Heven. Jotunheim. Muspelheim. Niffleheim. Nidavellir. Svartalfheim. Vanaheim. All Ten Realms have fallen to Dark Elf Malekith and his army, except one: Midgard. Home to Thor's beloved humans. Home to heroes and gods alike. All Hel breaks loose in a siege on Earth as Malekith and his allies begin their invasion – and our greatest heroes begin their ferocious defense!