Rocketing towards the planet Rigel in a Rigellian ship, Thor hopes to stop the Rigellian colonization of the planet Earth. Along the way, he is intercepted by a Rigellian Sky-Station, which demands he identify himself. Thor demands that they release their Space Lock on the Earth. Instead of complying with the Thunder God's demands, the Rigellians aboard the Sky Station board his shop. The aliens rely on their superior forcefield technology to try and stop Thor. However, this does not work, and he easily defeats them in battle with his hammer. He then forces this crew to take him the rest of the way to Rigel.

While on Earth, the Rigellian Colonizer Tana Nile uses her vast mental powers to get a police escort to the United Nations building.

Back on the planet Rigel, the Rigellian Colonizers send a robot Indestructible to deal with Thor. The robot blasts its way aboard his ship and engages in battle against the Thunder God. As the fight rages, Thor cannot stop the robot until Thor turns its disintegration device on itself, deactivating it. Thor demands the vessel go further when the ship is struck by a bolt of energy from the Black Galaxy, destroying a part of their vessel.

When the Rigellian Colonization Controller learns of Thor's progress, he gets involved directly. He goes to the Power Planet, the planetoid that controls their Space Lock, to ensure it is protected at all costs. Thor arrives shortly after, makes short work of the Rigellians, and is about to destroy their Space Lock device when the Grand Commissioner stops him.

The Grand Commissioner explains that there is a far greater menace in the universe coming out of the Black Galaxy. The Grand Commissioner informs Thor that they will free the Earth from their control if he ventures into the Black Galaxy and eliminates this threat. Thor agrees, and the Rigellians ask that Thor take one of their Recorder robots to document his travels.

Meanwhile, on Earth, Jane Foster (still acting on the hypnotic suggestion of Tana Nile) is on an airplane to Europe. She confides in her fellow man -- a piggish-looking man named Porga -- that she felt compelled to take this flight, a sensation he can relate to.

While back in space, Thor and the Recorder robot travel into the Black Galaxy and find that it is structured in an almost organic fashion, dubbed by the Recorder as a "Bio-Verse." Following their navigation, they come before Ego, the living planet, who tells the two that it has been waiting for them.

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