Thor and the Recorder have been left drifting in space when their spaceship is destroyed after being struck by the backlash of a battle between Ego the Living Planet and Galactus. The two are rescued from space by the Wanderers, a group of aliens who are the lone survivors of a world consumed by Galactus who have followed the Thunder God to seek out the world devourers' destruction.

Deep in the Black Galaxy, Ego and Galactus' battle rages on, the two appear evenly matched however in spite of their overwhelming cosmic powers. While aboard the Wanderer's ship, Thor and the Recorder revive and learn of their saviors' mission. Both the Recorder and Thor are against the idea of the Wanderers attacking Galactus directly, as they will surely meet their end, as Thor offers to fight Galactus on their behalf. Suddenly, their ship flies into a debris field created in the wake of the battle between Ego and Galactus.

Their ship arrives just as Galactus has managed to turn the tide of battle against Ego, prompting Thor to immediately jump into action, despite the Recorders' fear of Thor's destruction. Thor tosses his hammer at Galactus and, upon impact, causes the world eater to pause because it has caused him pain. Thor then goes in for a full frontal attack. However, Galactus has erected a force field around himself, making Thor's blows ineffectual. Galactus then grabs the Thunder God and tosses him at Ego's surface, where he finds that the Living Planet had brought the Wanderers and the Recorder to its surface as well.

Working together, the group constructs a weapon that channels Ego's massive energies through Thor's hammer and fires a beam at Galactus. The force of the beam causes Galactus great pain and threatens to destroy him. Not wanting to be destroyed, Galactus decides it's best that he depart and flees the Black Galaxy in defeat.

The Wanderers rejoice at Thor's victory over Galactus, and then much to their surprise, Ego invites them to live on his surface, adjusting his form so that the Wanderers can live on the fertile ground and allow them to sustain a way of life. Ego appears in a humanoid simulacrum to tell them they are welcome to live on his surface for the rest of their lives.

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