Basically they made him to combat Galactus:
http://www.alphaflight.net/character_overviews/guardian1/
"To Heather it appeared that Hudson had been atomized, with only ashes left behind. I truth what had happened, was that Hudson opened a rift in space and time, transporting him to Jupiter's seventh, and largest moon Ganymede. Not only was Mac transported in space, but also in time; Hudson had traveled back in time ten thousand years. Beneath the frozen surface of the moon, was an outpost for an alien race called the Qwrlln. The Qwrlln found Hudson, and using their advance technology sought to heal him. Not being familiar with human physiology, the Qwrlln assumed his battle suit was a part of his body. In healing him, they integrated his suite with his physiology, and nervous system. During that time they also built into Hudson's computer systems, a fail safe for themselves. Should they ever be under threat of their greatest fear, Galactus, Hudson would be their Secret Weapon."
http://www.geocities.com/Area51/Labyrinth/5525/jmh.html
"In actuality Hudson managed to channel the blast to create a spatial rift. He plunged through the rift to Ganymede, the largest of Jupiter's moons. There he was found by an outpost of the alien race called the Qu'wrlln. The aliens managed to save his life, but as they had never seen a human being before they didn't realize that his armor was not a natural part of his body. So they made a working synthesis of technological and organic systems, rendering Hudson a cyborg. When Hudson used the Qu'wrlln's scanning technology to check on Earth he discovered that the rift had taken him through time as well as space. Wishing to further aid their new friend the Qu'wrlln put James in suspended animation to await the proper time to go home.
The Qu'wrlln, however, were a race with a paranoid fear of Galactus, the world eater. When in recent human history Galactus was turned away from the Earth by super-humans, the Qu'wrlln were amazed. They decided to turn Hudson, who was still in suspended animation, into their agent in Earth's super-hero community. If Galactus ever troubled them they would use James to get super-human help. To this end they made modifications to the computer part of Hudson's cyborg mind. This would have severe repercussions for James later."