Tōru Furuya
— Issei Yuuki (voice)
Hideyuki Tanaka
— Jeff (voice)
Ichirō Nagai
— Chief Kodai (voice)
富山敬
— Manabu Yamato (voice)
潘恵子
— Mayu Hoshino (voice)
Masako Nozawa
— Mī-kun (voice) / Gugi (voice)
武藤礼子
— Hannah (voice) / Narration (voice)
戸谷公次
— Tsuyoshi Yūki (voice) / Yuri (voice)
塩屋浩三
— Jin Ren (voice)
松本零士
— Leiji Matsumoto (voice)
Masako Ikeda
— Fū the Alien (voice) / Yūki's Mother (voice)
つかせのりこ
— Yūki's Grandmother (voice)
槐柳二
— Yūki's Grandfather (voice)
麻上洋子
— Simba (voice)
Yuriko Yamamoto
— Eri Yūki (voice)