Arising from the startling experiments of research biologist Jeffrey Dexter there emerges a creature capable of endless reproduction, but possessing none of reservations of a natural human being. Dexter and his friend, Hal Walsh, are soon murdered, swept out of the path of the ruthless Multi-Man. Dexter's wife -- in her desperate efforts to prove that the new Jeffrey Dexter is only a cellular duplicate of her husband -- finds herself in an institution for the mentally unbalanced. Meanwhile Dexter No.2 develops his amazing plans; famous persons appear in duplicate urging Dexter's nomination as President of the new scientific era. Even Scotland Yard is powerless to hold him back -- except for one man, Detective-Sergeant Hanbuy...