Midway City is attacked by robot Viking Frost Giants commanded by Alvit Queen of Alfheim, a legendary Valkyrie astride a winged horse, who directs birds to attack Hawkgirl, while Hawkman deals with the giants. This is Alvit's test to see if he is worthy of being her new mate. Using a golden bugle, she spirits him through the Bifrost mists to Alfheim, a land inside the Earth. Fleeing there from the surface following a devastating nuclear war in the far future, the inhabitants have discovered immortality. Alvit had collected many champions from Earth's past previously, relegating each to suspended animation when she tired of him. Mentally compelled to try to win her, Hawkman is forced to test his worth, by fighting a mystically powered Viking ship sailing in a floating river. After this she