And that film was written by Jerome Bixby who wrote the 1953 story “It’s a Good Life” which was the basis for a 1961 episode of The Twilight Zone and which was included in Twilight Zone: The Movie (1983). He also wrote four Star Trek episodes: “Mirror, Mirror”, “Day of the Dove”, “Requiem for Methuselah”, and “By Any Other Name”. With Otto Klement, he co-wrote the story upon which the classic sci-fi movie Fantastic Voyage (1966), television series, and novel by Isaac Asimov were based.
I never knew Bixby wrote It. I have many fond memories of watching that film with my dad on WPIX’s Chiller Theater way back when.