The plot of the show will seemingly follow Ultraman Zero’s origins as his powers get taken away by his father, Ultraseven, and he is banished to a remote planet. There he trains under Ultraman Leo and learns about what it is to be an Ultra that strives to protect the lives of others.
Ultramen listed to appear are:
Ultraman, Ultraseven, Ultraman Leo, Ultraman Mebius, Ultraman
Zero, Ultraman Ginga, Ultraman Victory, Ultraman X, Ultraman Orb, Ultraman Geed,
Ultraman Rosso, Ultraman Blu, Ultrawoman Grigio, Ultraman Taiga, Ultraman Z, Ultraman
Trigger, Ultraman Decker, Ultraman Blazar, Ultraman Arc
With such a strong list of returning Ultramen, a large number of human hosts from the shows will also return, with listed hosts being:
Hikaru Raido (played by Takuya Negishi), Sho (Kiyotaka Uji), Daichi Ozora (Kensuke Takahashi), Gai Kurenai (Hideo Ishiguro), Riku Asakura (Tatsuomi Hamada), Leito Igaguri (Yuta Ozawa), Katsumi Minato (Yuya Hirata), Isami Minato (Ryosuke Koike), Asahi Minato (Arisa Sonohara), Hiroyuki Kudo (Yuki Inoue), Haruki Natsukawa (Kohshu Hirano), Kengo Manaka (Raiga Terasaka), Kanata Asumi (Hiroki Matsumoto), Gento Hiruma (Tomoya Warabino), Yuma Hize (Yuki Totsuka)
This list will be subject to change.
Sources:
Tsuburaya