Following their battle against Pluto in Hades, Thor and Hercules return to Olympus, where a joyous Hercules announces that he broke his Pact with Pluto to rule Hades in the Death God's place, much to the chagrin of Ares. Thor leaves Hercules to return to Earth so that he may be reunited with Jane Foster. Thor doesn't know that Jane Foster, under the hypnotic suggestion of her roommate Tana Nile, is leaving New York City to points unknown so that she does not get in the way of Tana's plans for Thor.

Tana Nile changes into her true form, that of a member of the alien Rigellian race who plans on attempting to colonize the Earth. Now in her true form, Tana calls in her Colonizer Commander to claim full rights of the planet Earth. She tries to refuse the colonizer ship to come to Earth and inspect the planet because she fears a battle will occur. However, the colonizers disagree, believing that other than their feared threat from the Black Galaxy, they are invincible to any other foes.

Thor, meanwhile, arrives on Asgard to ask his father if he would be allowed to marry Jane Foster, willing to forsake his godhood to do so. To Thor's surprise, Odin finally concedes and will allow Thor to marry Jane and remain the God of Thunder. Filled with joy, Thor rushes to Earth; however, when he goes to Jane Foster's apartment, he is attacked by Rigeillian Colonizers led by Tana Nile. Tana explains that they have laid claim to the Earth and intend to colonize it. When Thor tries to strike, Tana Nile uses her vast mental powers to subdue him. However, Thor attempts to resist. As he is being subdued, Tana Nile explains how they intend to take over the Earth by threatening to use a Space Lock device to move the Earth closer or farther from the sun and wipe out the human race with the extreme environmental changes.

Thor continues to resist, and the Colonizers are forced to use a "Proton Coagulant Ray," encasing the Thunder God in a block of solidified Protons. They decide that since, except for the entity in the Black Galaxy, Thor is the only one able to resist their mind probes, the Colonizers decide to take Thor back to their ship for examination. Before going, they give Tana Nile a wrist-control device for the Space Lock and give her complete colonization rights to the Earth.

The Colonizers load Thor into their ship and leave the Earth. However, Thor manages to break free of the proton cube he's been sealed in. As the ship flies into space, Tana Nile activates the Space Lock device and encases the Earth in its energy. Thor, meanwhile, confronts the Colonizers on the ship and finds that they have the strength that matches his own. However, Thor manages to best them in battle, easily knocking them out.

With the Colonizers on the ship knocked out, Thor decides to allow the ship to continue its course to the planet Rigel so that he may stop the Rigellians from taking over the Earth.

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