Invasion of Astro-Monster; known in Japan as Great Monster War (怪獣大戦争, Kaijū Daisensō?); Monster Zero and Godzilla vs. Monster Zero in the United States; and Invasion of the Astro-Monsters in the United Kingdom, is a Toho kaiju film released in 1965 as a direct sequel to Ghidorah, the Three-Headed Monster. It is sixth in the Godzilla series, popular in the West for having the Japanese series' only Hollywood lead, Nick Adams. It is the second film to feature King Ghidorah and the third film to feature Rodan. It is the first Godzilla film to feature alien invaders and the last to feature the popular 1960s tokusatsu team of director Ishirō Honda, screenwriter Shinichi Sekizawa, and special effects director Eiji Tsuburaya.