Taiyo Sugiura as Musashi Haruno / Ultraman Cosmos

Miho Kaneko as Mari Kawase

Masatoshi Matsuo as Alien Gyashi Jin

Mai Saito as Alien Gyashi Shau

Shingo Kazami as Kido

Risa Saito as Hyuga

Nobuyuki Kase as Kanou

Koji Nakamura as Makabe

Yasufumi Hayashi as Tsutomu Sasaki

Ryou Nitta as Shoji

Rowena Ogo as Rita

Sanae Natsukawa as Boys and Girls of Blue Area 1

Tomo Miura as Boys and Girls of Blue Area 2

Yoshinobu Noda as Boys and Girls of Blue Area 3

Taku Toyama as Boys and Girls of Blue Area 4

Yuki Oruyi as Boys and Girls of Blue Area 5

Naoki Tanoue as Boys and Girls of Blue Area 6

Junya Yamamoto as Boys and Girls of Blue Area 7

Yūsuke Takada as Boys and Girls of Blue Area 8

Kanj Kubo as Boy from Kitakyushu

Aya Sugimoto as Reporter

Daisuke Shima as Harumitsu Hiura

Kaori Sakagami as Shinobu Mizuki

Hidekazu Ichinose as Keisuke Fubuki

Koichi Sudo as Koji Doigaki

Mayuka Suzuki as Ayano Morimoto

Ryô Kinomoto as Kinozaki

Mio Takaki as Akagi

Akitoshi Ohtaki as Hijikata

Kyūsaku Shimada as Inugai

Hidekazu Akai as Yujiro Haruno

Tetsu Inada as Ultraman Cosmos (voice)

Osamu Ryuutani as Ultraman Justice (voice)

Rina Mogami as Shirubyi (voice)

Daisuke Gori as Sandros (voice)

Yuka Koyama as Female Operator (voice)

Koji Ishizaka as Narration (voice)