Collects Thor (1966) #195-205.

All hail Asgard, 'cause it's time for another dose of the Mighty Thor! When Odin sends Thor on a quest to the World's End, Loki looses Mangog, the monster powered by the anger and hatred of a billion beings! It's an all-out epic that leads to the tragic death of the All-father Odin. But death is not the end! Pluto, Lord of Hades, comes to claim Odin's soul -and a war with Hela, Norse Queen of the Dead, erupts. Then, an experiment by the Rigellian Colonizers unleashes Ego-Prime! The cosmic menace embarks on a time-twisting, evolution-bending rampage -and once the dust settles, Thor and company will be exiled to Earth. And to top it off, Mephisto pits Thor against the ones he loves the most.