(Dutch: Het Geheim van de Nitronstralen)
Art by Don Lawrence & Script by Dick Matena
The Azurian Armada makes its way toward Earth, but they find the human forces ready to meet them. After a pitch battle, the Armada is defeated and many Azurian troops are captured on the battlefield of the Moon.
One of the prisoners delivers a message to Solon: It says that his parents have been taken captive if he doesn't sabotage the Earth fleet and deliver Storm to the Azurian command. Solon feels he has no choice but to do what they want.
Solon sets a bomb that destroys the fleet based on the Moon. Only one fighter remains which Storm plans to take to the Earth for reinforcements--and Solon goes with him. They have only just left when an Azurian fighter contingent strikes the room.
Balder and his men are helpless before the onslaught. They are forced to take refugee in the old Azurian nitron mines; Nitron being a precious mineral that unfortunately admits a lethal radiation that causes "nitron fever." The Earth men will rely on their spacesuits to protect them from the radiation.
In the mines, they encounter an old Azurian that quickly dies from nitron radiation and the bodies of others who have succumbed, but also:
Meanwhile, Storm has returned with the remaining fleet to find their moon base destroyed. Before Storm can land, Solon pulls a gun and forces him to set course for the Azurian base. The Earth reinforcements enter the nitron mines and aid their trapped friends in defeating the Azurian troops. In the aftermath, they decide to send the young girl they found to Earth to try and discover how she was able to survive and then put her in a foster home.
On the way to the Azurian base, Solon forces Storm from the ship, then pilots it directly into the Azurian domed command center. Somehow, Storm jetpacks back to the moon where he finds the letter and realizes why Storm did what he did. His sacrifice was not in vain. After such a blow, the Earth forces are able to rout the remaining Azurians and drive them from the inner system. The fight for Earth is ended. It is free for the first time in centuries, and Storm is hailed as a hero.
TO BE CONTINUED