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The working title of the film was The Colossal Man. Producer-writer-director Bert I. Gordon filmed a sequel to The Amazing Colossal Man, the 1958 American International production War of the Colossal Beast (see below), which starred Dean Parkin in the role of "Lt. Col. Glenn Manning." Russ Bender, June Jocelyn and Jack Kosslyn appear in both productions, but play different roles in each film. Although in The Amazing Colossal Man, Glenn's fiance states that Glenn has no family, in War of the Colossal Beast, Glenn has a sister "Joyce" and his fiance is not mentioned. Several scenes from The Amazing Colossal Man appear in War of the Colossal Beast, despite the role of Glenn being played by different actors.