Marcus Chaney is the only human who had used the Dream Machines that was not body-swapped with a Martian. He used to work as an actuary for the firm of Dicker and Higgins, but then fate had him on the space cannon when it was launched. In Olympus, they thought he'd gone mad after using the Dream Machine, and chased him away. Chaney then took up camp in Hellas. In the end, he returned to Earth in the new capsule.