The cover to the hardcover, 1977 W. H. Allen first UK edition
The cover to the 1975 first paperback edition
Cyborg IV was the fourth and final Martin Caidin-penned novel of the Cyborg series. Its original publication came in April 1975 by Arbor House Publishing. In this original edition, it was subtitled, The "Six Million Dollar Man" in a space adventure of the near future even though, like the other novels written by Caidin, the book follows a different continuity than the TV series. Its first paperback release came in 1976, when - despite its title - it was the sixth and final numbered entry of the Six Million Dollar Man Warner paperback series.