The Massacre of Mankind (2017) is a science fiction story by Stephen Baxter conceived as a sequel to H.G. Wells' 1898 classic "The War of the Worlds".
 It begins 14 years after the original novel in 1907, from the point of view of Miss Elphinstone, the ex-sister-in-law of the narrator of "War of the Worlds".
 It was written by Stephen Baxter, who also wrote the sequel to Wells' novel "The Time Machine", called "The Time Ships".
Edward Page Mitchell (1852–1927) was an American editorial and short story writer for "The Sun", a daily newspaper in New York City.
 He became that newspaper's editor in 1897, succeeding Charles Anderson Dana.
 Mitchell was recognized as a major figure in the early development of the science fiction genre.
 Mitchell wrote fiction about a man rendered invisible by scientific means ("The Crystal Man", published in 1881) before H.G. Wells's "The Invisible Man", wrote about a time-travel machine ("The Clock that Went Backward") before Wells's "The Time Machine", wrote about faster-than-light travel ("The Tachypomp"; now perhaps his best-known work) in 1874, a thinking computer and a cyborg in 1879 ("The Ablest Man in the World"), and also wrote the earliest known stories about matter transmission or teleportation ("The Man without a Body", 1877) and a superior mutant ("Old Squids and Little Speller").
 "Exchanging Their Souls" (1877) is one of the earliest fictional accounts of mind transfer.
 Mitchell retired in 1926, a year before dying of a cerebral hemorrhage.
The Invisible Man (later known as H.G. Wells' Invisible Man) is a British black-and-white science fiction/adventure/espionage television series that aired on ITV from September 1958 to July 1959.
 It was aired on CBS in the United States, running two seasons and totalling 26 half-hour episodes.
 The series was nominally based on the novel by H. G. Wells, one of four such television series.
 In this version, the deviation from the novel went as far as changing the main character's name from Dr. Griffin to Dr. Peter Brady who remained a sane man, not a power-hungry lunatic as in the book or the 1933 film adaptation.
 None of the other characters from the novel appeared in the series.
The Hampdenshire Wonder is a 1911 science fiction novel by J.D. Beresford.
 It is one of the first novels to involve a wunderkind.
 The child in it, Victor Stott, is the son of a famous cricket player.
 This origin is perhaps a reference to H.G. Wells's father Joseph Wells.
 The novel concerns his progress from infant to almost preternaturally brilliant child.
 Victor Stott is subtly deformed to allow for his powerful brain.
 One prominent, and unpleasant, character is the local minister.
 As J.D. Beresford's father was a minister, and Beresford was himself partially disabled, some see autobiographical aspects to the story.
 However this is unproven.
The Martian War: A Thrilling Eyewitness Account of the Recent Invasion As Reported by Mr. H.G. Wells is a 2006 science fiction novel by Kevin J. Anderson under his pseudonym Gabriel Mesta.
 It is a retelling of H.G. Wells' "The War of the Worlds" similar to Anderson's past work, "".
 It recounts the Martian invasion from a variety of viewpoints, and has ties to Wells' other work.
Rajdrohi : Fight Against The System is a 2009 Science fiction Bengali film directed by Tapan Banerjee.
 This is sixth directorial film after 2007 "Prem".
 The film is starring Anshuman, Swati, Manali and Rajatava Dutta.
 This film is slated to release on 25 December 2009 and is the first science fiction film of its kind in Bengali till date.
 The film deals with invisibility of human being and is quite similar to H.G. Wells' The Invisible Man
Amazing Stories Quarterly was a U.S. science fiction pulp magazine published from 1928 to 1934.
 It was launched by Hugo Gernsback as a companion to his "Amazing Stories", the first science fiction magazine, which had begun publishing in April 1926.
 "Amazing Stories" had been successful enough for Gernsback to try a single issue of "Amazing Stories Annual" in 1927, which had sold well, and he decided to follow it up with a quarterly magazine.
 The first issue of "Amazing Stories Quarterly" was dated Winter 1928 and carried a reprint of H.G. Wells' "When the Sleeper Wakes".
 Gernsback's policy of running a novel in each issue was popular with his readership, though the choice of Wells' novel was less so.
 Over the next five issues only one more reprint appeared: Gernsback's own novel "Ralph 124C 41+", in the Winter 1929 issue.
 Gernsback went bankrupt in early 1929, and lost control of both "Amazing Stories" and "Amazing Stories Quarterly"; his assistant, T. O'Conor Sloane, took over as editor.
 The magazine began to run into financial difficulties in 1932, and the schedule became irregular; the last issue was dated Fall 1934.
Herbert George Wells (21 September 1866 – 13 August 1946), usually referred to as H. G. Wells, was an English writer.
 He was prolific in many genres, including the novel, history, politics, social commentary, and textbooks and rules for war games.
 Wells is now best remembered for his science fiction novels and is called a "father of science fiction", along with Jules Verne and Hugo Gernsback.
 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).
 He was nominated for the Nobel Prize in Literature four times.
"The Limits of Individual Plasticity" is a short essay written by science fiction author H.G. Wells (21 September 1866 – 13 August 1946) in 1895.
 In it, H.G. Wells speculates his theories
The First Men in the Moon, also promoted as H.G. Wells' The First Men in the Moon, is a 2010 made for TV drama written by Mark Gatiss, directed by Damon Thomas, that stars Gatiss as Cavor and Rory Kinnear as Bedford, with Alex Riddell, Peter Forbes, Katherine Jakeways, Lee Ingleby and Julia Deakin.
 "The First Men on the Moon" was first broadcast on 19 October 2010 on BBC Four.
 It is an adaptation of H. G. Wells' science fiction novel of the same name.
 This is the third collaboration between Thomas and Gatiss (after "The Worst Journey In The World" and "Crooked House"), and the first film to be produced by their production company Can Do Productions.

Question: How many television series were based off of science fiction novels by H.G. Wells? 
Answer: four