- Chris Hackney (Fire Emblem: Three Houses) as Shinji Kaminaga/Ultraman
- Dawn M. Bennett (Wonder Egg Priority) as Hiroko Asami
- Brandon McInnis (Dr. Stone) as Akihisa Taki
- Emily Frongillo (Fazbear & Friends) as Yumi Funaberi
- Brook Chalmers (Demon Slayer: Kimetsu no Yaiba) as Tatsuhiko Munakata
- Matt Shipman (Attack on Titan, One Piece) as Kagami
- Jordan Woollen (Show Time!) as Mefilas
- Kellen Goff (JoJo's Bizarre Adventure: Golden Wind) as Zarab
- Jim Foronda (The Quintessential Quintuplets) as Government Official
Lastly, even if you missed the film, it was also announced that Shin Ultraman is also coming to video on demand, and on home video for Blu-ray and DVD this Spring 2023 via Cleopatra Entertainment in United States territories.
[Additional details from Ultraman Wiki]