Decisive Battle Under the Setting Sun (落日の決闘 Rakujitsu no Kettō) is the thirty-second episode of Return of Ultraman.
MAT was investigating the frequently occurred earthquakes on Mt. Ryujin. Go went on an investigation for Ryujin Tunnel after knowing the accident happened in the tunnel 10 years ago. An earthquake happened again and Go lost his consciousness in a collapse. Monster King Maimai, the cause of earthquakes, appeared and was taken down by MAT! That's what it seemed to be...
- Hideki Go (郷 秀樹 Gō Hideki ):Jiro Dan (団 時朗, Dan Jirō )
- Ryu Ibuki (伊吹 竜, Ibuki Ryu ):Negami Atsushi (根上 淳, Negami Atsushi )
- Takeshi Minami (南 猛 Minami Takeshi ):Shunsuke Ikeda (池田 駿介, Ikeda Shunsuke )
- Ippei Ueno (上野 一平, Uneo Ippei ):Hatashi Mitsushi (三井 恒, Mitsushi Hatashi )
- Yuriko Oka (丘 ユリ子, Oka Yuriko ):Mika Katsuragi (桂木美加,Katauragi Mika )
- Fumio Kishida (岸田文夫 Kishida Fumo ):Ken Nishida (西田健, Nishida Ken )
- Ken Sakata (坂田健, Ken Sakata ):Shin Kishida (岸田森, Kishida Shin )
- Jiro Sakata (坂田 次郎, Sakata Jirō ):Kawaguchi Hideki (川口英樹, Hideki Kawaguchi )
- Narrator (ナレーター, NaretaAkira Nagoya (名古屋章, Nagoya Akira ) ):
- King Maimai (Larva and Adult)
- Return of Ultraman Volume 8 Features episodes 29-32.