A secret pact between Ahab and the Red Skull will bring horror to all mutants. But against his masters’ orders, a deranged and vengeful Sentry kills an Uncanny Avenger! It’s no hoax, no dream…and only the first casualty of many! To allow reinforcements from other eras, the Wasp must find and destroy the Twins’ tachyon transmitter, but first she’ll have to defeat the Grim Reaper. Meanwhile, the Scarlet Witch makes an impossible choice that will define her forever. And Sunfire and Rogue, without backup, must defeat the combined might of both Apocalypse Twins – or watch the end of our world! Bring on the bad guys, because Ragnarök is now!