According to the account given by Marvel editor-in-chief Roy Thomas on the letters page of Amazing Adventures #18, the new feature that made its debut in that issue had been gestating for some time.  (“Two long and not always enjoyable years,” to quote the man himself.)  It had all started in 1971, when Marvel was looking to expand its market share in a big way, and Stan Lee (himself still editor-in-chief at that time) asked Thomas to submit a list of ideas for new comics for consideration by Lee and Marvel’s publisher, Martin Goodman.  Among those ideas was a series concept based on H.G. Wells’ classic late-Victorian science fiction novel, The War of the Worlds.

More specifically, Thomas imagined “a vast, hopefully unending sequel to the Wells classic.  A storyline which would pit earthmen in a kind of guerrilla warfare against the Martians, who had returned approximately 100 years after their initial invasion attempt… and who this time had come, seen, and conquered.”  Read More