How many television series were based off of science fiction novels by H.G. Wells? 
The Invisible Man (1958 TV series):  The series was nominally based on the novel by H. G. Wells, one of four such television series. H. G. Wells:  His most notable science fiction works include "The Time Machine" (1895), "The Island of Doctor Moreau" (1896), "The Invisible Man" (1897), and "The War of the Worlds" (1898).
four