[Transcriber Note: This etext was produced from IF Worlds of Science Fiction March 1953. Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.]...

After the Doctor gave him the hypo and left the ship, Bowren lay in absolute darkness wondering when the change would start. There would be pain, the Doctor had said. "Then you won't be aware of anything—anything at all." That was a devil of a thing, Bowren thought, not to be aware of the greatest adventure any man ever had. He, Eddie Bowren, the first to escape the Earth into space, the first man to Mars! He was on his back in a small square steel cubicle, a secretly constructed room in the wal