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The working titles of this film were Revenge of the Colossal Man and The Colossal Beast. In the black and white film's closing moments, when "Glenn" is electrocuted, the film changes to color. War of the Colossal Beast was a sequel to American International Pictures' 1957 production The Amazing Colossal Man, which starred Glenn Langan as "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 earlier picture appear in War of the Colossal Beast, despite the role of Glenn being played by different actors in each film.