The Hunter Out Of Time — Gardner Francis Fox

Kevin Cord, adventurer of the 20th Century, or Chan Dahl, docile outcast of the far future..which was he? For the two looked exactly alike, their fingerprints were identical, and only one of them was still alive. The pursueers from the future snatched the remaining man, took him back across the eons, across Time's forbidden Red Line, to search his brain. For buried in the mind of Chan Dahl was the answer to who was to rule the cosmos. But they had the wrong man--and with all time and space as a hiding ground, Kevin escaped...

There were other worlds around us before we touched down on Earth again. A blue planet where a massive azure ball glowed, sending out white streamers into a midnight sky, puzzled us. The azure ball seemed to be alive....
We saw a planet where only metal robots moved about. The world on which they lived was barren; perhaps the robots had made it that way....
As a scientist, I grieved for the lack of opportunity to enter and explore these visions of infinity. They went on and on, swinging into view and then out of view glimpses of reality until now shrouded from the eyes of men.
On one world we appeared above a man who battled a scaled monster with a sword. A woman lay crumpled at his feet....
THE HUNTER OUT OF TIME is a pursuit through all the futures and all the worlds as only a master science-fiction adventure-narrator can tell it!