Taiyo Sugiura as Musashi Haruno / Ultraman Cosmos

Kounosuke Tokai as Young Musashi (stock footage)

Kazue Fukiishi as Julie / Ultraman Justice

Hidekazu Ichinose as Keisuke Fubuki

Kei Shimizu as Eiichi Kashima

Yurika Asada as Natsuki Kuramoto

Masaki Nishina as Ryojiro Shoda

Dai Tōjō as Kazumi Watarai

Daisuke Shima as Harumitsu Hiura

Kaori Sakagami as Shinobu Mizuki

Koichi Sudo as Koji Doigaki

Mayuka Suzuki as Ayano Morimoto

Miho Kaneko as Mari Kawase

Hyoei Ichikawa as Ikeyama

Masatoshi Matsuo as Alien Gyashi Jin

Mai Saito as Alien Gyashi Shau

Suzuka Ohgo as Mio

Nana Horie as Yukari Yoshii (stock footage)

Shingo Kazami as Kido (stock footage)

Risa Saito as Hyuga (stock footage)

Nobuyuki Kase as Kanou (stock footage)

Koji Nakamura as Makabe (stock footage)

Kazuho Mitsuta as SRC China Representative

Richard Kuroppu as SRC Representatives from Each Country 1

Inge Murata as SRC Representatives from Each Country 2

Mark Murdoch as SRC Representatives from Each Country 3

Kōichi Koshimura as Announcer

Akitoshi Ohtaki as Hijikata

Kyūsaku Shimada as Inugai

Mio Takaki as Akagi

Hitomi Takahashi as Michiko Haruno

Tamio Kawachi as Owada

Yuhki Sato as Ultraman Cosmos (voice)

Tetsu Inada as Ultraman Cosmos / Ultraman Legend (voice)

Osamu Ryuutani as Ultraman Justice (voice)

Rina Mogami as Shirubyi (voice)

Chisako Hara as Delacion (voice)

Makiko Mizogami as Staff Announcement / Computer (voice)

Akira Matsuki as Narration in Wall Monitor (voice)

Bomber Morio as Narrator (voice)