Searching for the power sources of Earth X, Captain America and Captain Mar-Vell travel to the Savage Land and Limbo?where they must fight Space Phantoms, Dire Wraiths and the demon known as Belasco! And in Death's realm, Mar-Vell's band of heroes face Thanos! Featuring the fates of this alternate world's Magik, Ka-Zar, Shanna, the X-Men, the Inhumans and Magneto!