Plot Summary: Into the Deep with Doraemon
Doraemon the Movie: New Nobita and the Castle of the Undersea Devil (original title: 映画ドラえもん 新・のび太の海底鬼岩城) takes the familiar gang far beneath the waves. Nobita, Shizuka, Gian and Suneo are eager to explore the ocean, and Doraemon’s futuristic gadgets give them the means to travel and stay underwater for real. One companion on the journey is the Underwater Buggy, a talkative vehicle with a personality of its own.
As the group ventures deeper, the seabed turns out to be much more than coral and fish. They uncover signs of a lost civilisation and eventually reach a mysterious castle hidden on the ocean floor. They also meet a new character named Eru. Meanwhile, the deep sea itself is far from peaceful, with earthquakes and volcanic activity stirring beneath the surface.
The story is built around exploration and friendship. The five friends have to rely on one another, and on Doraemon’s inventive tools, as their underwater outing grows into a much bigger adventure.
Review Guide: What Makes This Doraemon Film Notable
- A remake of a classic story: As the “New” in the title suggests, this is a remake based on the original Doraemon manga. It returns to an undersea tale for today’s audience.
- Director and writer: The film is directed by Tetsuo Yajima from a screenplay by Isao Murayama.
- Voice cast: Wasabi Mizuta voices Doraemon, Megumi Oohara plays Nobita, Yumi Kakazu is Shizuka, Subaru Kimura is Gian and Tomokazu Seki is Suneo. They are joined by Shoya Chiba as Eru and Ryo Hirohashi as the Underwater Buggy.
- Production: This is a Japanese animated feature from Shin-Ei Animation and Fujiko Productions, with TOHO, Shogakukan, TV Asahi, ADK and Shogakukan-Shueisha Productions also involved.
- Genre and length: It is an animated family adventure with fantasy elements, running 102 minutes, with dialogue in Japanese.
For anyone looking for a review, the film’s ingredients are clear. It offers gadget-driven exploration, an underwater setting, a lost-civilisation mystery and the franchise’s trademark focus on teamwork among friends.
Who Will Enjoy It
- Families looking for an animated adventure suitable for younger viewers
- Long-time Doraemon fans curious to see a classic tale reimagined
- Anime viewers who enjoy ocean settings and underwater worlds
- Kids who love inventive gadgets and exploration stories
- Fans of lost-civilisation mysteries told in a lighthearted way
Release Date & Where to Watch
The film was first released on 27 February 2026. A US release date has not been announced yet.
Streaming availability in the US is not yet listed in TMDB/JustWatch data as of 24 October 2026. Check back for updates on where to watch it in your region.
Cast
Wasabi Mizutaas Doraemon (voice)
Megumi Ooharaas Nobita (voice)
Yumi Kakazuas Shizuka (voice)
Subaru Kimuraas Gian (voice)
Tomokazu Sekias Suneo (voice)
Shoya Chibaas Eru (voice)
Ryo Hirohashias Underwater Buggy (voice)
Photo: TMDB
FAQ
- When was Doraemon the Movie: New Nobita and the Castle of the Undersea Devil released?
- It was first released on 27 February 2026. A US release date has not been announced yet.
- Where can I watch it in the US?
- US streaming availability is not yet listed in TMDB/JustWatch data as of 24 October 2026.
- Who is in the voice cast?
- Wasabi Mizuta (Doraemon), Megumi Oohara (Nobita), Yumi Kakazu (Shizuka), Subaru Kimura (Gian) and Tomokazu Seki (Suneo) lead the cast. Shoya Chiba voices Eru and Ryo Hirohashi voices the Underwater Buggy.
- How long is the film?
- The runtime is 102 minutes.
- Is it a remake?
- Yes. As the "New" in the title indicates, it is a remake based on the Doraemon manga. It is directed by Tetsuo Yajima and written by Isao Murayama.
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