T was utterly alone, but the machine which carried him had company on its flight. Eleven other identical machines – each occupied by beings similar to T – bore through the continuum. This continuum was empty and lightless and stood in the same relationship to the universe as a fold in a silk dress stands to the dress: when the sides of the fold touch, a funnel is formed by the surface of the material inside the surface of the dress. Or you may liken it to the negativity of the square root of minus two, which has a positive value. It was a vacuum inside a vacuum. The machines were undetectable, piercing the dark like light itself and sinking through the hovering millennia like stones.
The twelve machines were built for an emergency by a nonhuman race so ancient that they had abandoned the construction of other machinery eons before. They had progressed beyond the need of material assistance – beyond the need of corporal bodies – beyond the need at least of planets with which to associate their tenuous egos. They had come finally, in their splendid maturity, to call themselves only by the name of their galaxy, Koax. In that safe island of several million stars they moved and had their being, and brooded over the coming end of the universe. But while they brooded, another race, in a galaxy far beyond the meaning of distance, grew to seniority. The new race, unlike the Koax, was extrovert and warlike; it tumbled out among the stars like an explosion, and its name was Man. There came a time when this race, spreading from one infinitesimal body, had multiplied and filled its own galaxy. For a while it paused, as if to catch its breath – the jump between stars is nothing to the gulf between the great star cities – and then the time/space equations were formulated; Man strode to the nearest galaxy armed with the greatest of all weapons, Stasis. The temporal mass/energy relationship that regulates the functioning of the universe, they found, might be upset in certain of the more sparsely starred galaxies by impeding their orbital revolution, causing, virtually, a fixation of the temporal factor – Stasis – whereby everything affected ceases to continue along the universal time-flow and ceases thereupon to exist. But Man had no need to use this devastating weapon, for as on its by-product, the Stasis drive, he swept from one galaxy to another, he found no rival, nor any ally. He seemed destined to be sole occupant of the universe. The innumerable planets revealed only that life was an accident. And then the Koax were reached.
The Koax were aware of Man before he knew of their existence, and their immaterial substance cringed to think that soon it would be torn through by the thundering drives of the Supreme Fleet. They acted quickly. Materializing onto a black dwarf, a group of their finest minds prepared to combat the invader with every power possible. They had some useful abilities, of which being able to alter and decide the course of suns was not the least. And so nova after nova flared into the middle of the Supreme Fleet. But Man came invincibly on, driving into the Koax like a cataclysm. From a small, frightened tribe a few hundred strong, roaming a hostile earth, he had swelled into an unquenchable multitude, ruling the stars. But as the Koax wiped out more and more ships, it was decided that their home must be eliminated by Stasis, and ponderous preparations were begun. The forces of Man gathered themselves for a massive final blow.
Unfortunately, a Fleet Library Ship was captured intact by the Koax, and from it something of the long, tangled history of Man was discovered. There was even a plan of the Solar System as it had been when Man first knew it. The Koax heard for the first time of Sol and its attendants. Sol at this time, far across the universe, was a faintly radiating smudge with a diameter twice the size of the planetary system that had long ago girdled it. One by one, as it had expanded into old age, the planets had been swallowed into its bulk; now even Pluto was gone to feed the dying fires. The Koax finally developed a plan that would rid them entirely of their foes. Since they were unable to cope in the present with the inexhaustible resources of Man, they evolved in their devious fashion a method of dealing with him in the far past, when he wasn’t even there. They built a dozen machines that would slip through time and space and annihilate Earth before Man appeared upon it; the missiles would strike, it was determined, during the Silurian Age and reduce the planet to its component atoms. So T was born.
‘We will have them,’ one of the greatest Koax announced in triumph when the matter was thrashed out. ‘Unless these ancient Earth records lie, and there is no reason why they should, Sol originally supported nine planets, before its degenerate stage set in. Working inwards, in the logical order, these were – I have the names here, thanks to Man’s sentimentality – Pluto, Neptune, Uranus, Saturn, Jupiter, Mars, Earth, Venus and Mercury. Earth, you see, is the seventh planet in, or the third that was drawn into Sol in its decline. That is our target, gentlemen, a speck remote in time and space. See that your calculations are accurate – that seventh planet must be destroyed.’
There was no error. The seventh planet was destroyed. Man never had any chance of detecting and blasting T and his eleven dark companions, for he had never discovered the mingled continuum in which they travelled. Their faint possibility of interception varied inversely with the distance they covered, for as they neared Man’s first galaxy, time was rolled back to when he had first spiralled tentatively up to the Milky Way. The machines bore in and back. It was growing early. The Koax by now was a young race without the secret of deep space travel, dwindling away across the other side of the universe. Man himself had only a few old-type fluid fuel ships patrolling half a hundred systems. T still lay in his fixed position, waiting. His two centuries of existence – the long wait – were almost ended. Somewhere in his cold brain was a knowledge that the climax lay close now. Not all of his few companions were as fortunate, for the machines, perfect when they set out, developed flaws over the long journey (the two hundred years represented a distance in space/time of some ninety-five hundred million light-years). The Koax were natural mathematical philosophers, but they had long ago given up as mechanics – otherwise they would have devised relay systems to manage the job that T had to do.
The nutrition feed in one machine slowly developed an increasing rate of supply, and the being died not so much from overeating as from growing pains – which were very painful indeed as he swelled against a steel bulkhead and finally sealed off the air vents with his own bulging flesh. In another machine, a valve blew, shorting the temporal drive; it broke through into real space and buried itself in an M-type variable sun. In a third, the guide system came adrift and the missile hurtled on at an increasing acceleration until it burned itself out and fried its occupant. In a fourth, the occupant went quietly and unpredictably mad, and pulled a little lever that was not then due to be pulled for another hundred years. His machine erupted into fiery, radioactive particles and destroyed two other machines as well.
When the Solar System was only a few light-years away, the remaining machines switched off their main drive and appeared in normal space/time. Only three of them had completed the journey, T and two others. They found themselves in a galaxy now devoid of life. Only the great stars shone on their new planets, fresh, comparatively speaking, from the womb of creation. Man had long before sunk back into the primeval mud, and the suns and planets were nameless again. Over Earth, the mists of the early Silurian Age hovered, and in the shallows of its waters molluscs and trilobites were the only expression of life. Meanwhile T concentrated on the seventh planet. He had performed the few simple movements necessary to switch his machine back into the normal universe; now all that was left for him to do was to watch a small pressure dial. When the machine entered the atmospheric fringes of the seventh planet, the tiny hand on the pressure dial would begin to climb. When it reached a clearly indicated line on the dial, T would turn a small wheel (this would release the dampers – but T needed to know the How, not the Why). Then two more gauges would begin