A hunting trip is interrupted when the hunters find a miniature spaceship, only for its violent pilot to kill them in quick succession. At about the same time, in space, the TDF’s Space Station V3 receives transmissions from some alien source. Contacting the Ultra Guard, who are also receiving the messages, V3’s captain and Captain Kiriyama try to understand the source, which is revealed to be a warning concerning a violent interstellar criminal known as 303: the very alien now on Earth.

The Ultra Guard extols the virtue of the weapon, the R1, which is capable of producing the force of 8000 hydrogen bombs, but Dan is chilled at the destructive power, believing it to be an impediment to permanent peace in the universe. Its creator chooses the planet Gyeron, far away and seemingly uninhabited, for a test. But a being from the planet, Gyeron, mutated to a monster and races toward Earth, proving that incorrect.

A young woman connected to a strange UFO, temporarily blinds Dan and steals his Ultra Eye while he is out on patrol. She then sends a signal out into space, asking for pickup from the Magellan Nebula. Back at headquarters, they learn that the Magellans have already launched an interplanetary missile at the Earth, and are abandoning their agent. Dan’s only recourse is to find the Ultra Eye before it’s too late as the Ultra Hawks find their weaponry ineffective against the missile.

After collapsing, Dan’s seizing body is brought to the med bay. The Ghose retrieve Pandon and begin repairing with robotic parts to replace its lost limbs. Using Amagi as a hostage and to speak to humanity, the Ghose outline their demands: all humans are to surrender unconditionally and be moved to the Ghose colony of Mars. If there is any resistance, the Ghose will detonate their drill bombs to destroy all of Earth’s major cities.