Mark Harris is an agent with the FOR.
That acronym is one I came up with for the Foundation for Oceanic Research, described as a governmental agency which is deeply involved in top secret research and exploration of the deep waters of the various oceans on the planet. It does most of its work onboard a pretty impressive and large submarine called the <i>Cetacean</i>.
The title for this entry is "Man From Atlantis" and considering the amazing characteristics of Harris, it is easy to believe that is the man's actual place of origin. The man has webbed hands and feet and apparently gills (I read that but looking at the pictures could not actually see them). He can not only breath underwater without any problem, he can swim at an incredible speed using a wiggle style reminiscent of an eel and can handle depths which are almost unbelievable. Since the lost civilization of Atlantis is fantasied to exist on the ocean floor, thinking someone of Harris's abilities might come from there is not unreasonable.
But Harris has no idea where he is from and therefore no one else does either. When he is first encountered, he is lying on a beach unconscious mired in sand and seaweed. How he got there or why he has no recollection of anything is a mystery that will not be solved during the run of his adventures. His background and origin are total blanks to him; he does not even have any idea of his own name. 'Mark Harris' is the name given him by the woman who found him on that beach and nursed him back to help, Dr. Elizabeth Merrill.
Once he recovered from whatever caused his trouble in the first place and feeling grateful to Merrill and the government institute she worked for, plus needing answers to his situation and feeling that an organization devoted to the study of the seas would be an asset there, he decides to stick around and help them out on their missions.
It will be those missions that warrant his membership in this compendium. The Foundation has loads of interesting and important studies constantly going on but their governmental budget is allotted it because it also performs vital oceanic-related work. In the first instance given him, a submarine was missing and some important people were onboard (never mind the poor fools stationed on her!). When it turns out that vessel has been snatched by a maniacal fiend named Mr. Schubert as part of his diabolical plan to destroy all the major powers, Harris will have as a chance to show his value to the Foundation.
From then on, the assignments that come his way will be a mixture of mad-chaps out to cause great harm or space aliens coming to visit and possibly cause great harm or even magical imps with a bizarre sense of humor which invariably causes great harm. Throughout all of these adventures, Harris will be assisted by the lovely, very intelligent, and soon-to-be devoted Dr. Merrill.