This has the unusual distinction of being a remake of a movie that was never made in the first place. When American International made a deal with Larry Buchanan to remake some of their movies ("It Conquered the World" became "Zontar, the Thing from Venus," "The She-Creature" became "Creature of Destruction" and so forth), they evidently included a script based on Richard Matheson's story "Being." The production had gone by several titles, including "G.O.O.", and was to have starred Peter Lorre and Elsa Lanchester. Apparently Lorre's death canceled the project, so AIP earned back some of their money by passing the script on to Buchanan.
The monster in this movie originally appeared in director Larry Buchanan's earlier movie Creature of Destruction (1967).
The last of director Larry Buchanan's 8 Azalea productions, bearing a 1969 copyright. Earliest TV showings March 1970.