The much-loved blue robotic cat is returning to the big screen with a brand-new underwater adventure. Doraemon: Castle of the Undersea Devil is an upcoming animated movie that takes Doraemon, Nobita and their friends into a mysterious world beneath the ocean.
The Doraemon: Castle of the Undersea Devil Movie Trailer gives viewers a glimpse of the adventure waiting for the group. What starts as an exciting underwater camping trip soon turns into a much bigger mission involving a mysterious underwater civilization, an ancient castle and a dangerous force.
The movie is scheduled to release in Indian cinemas on October 2, 2026, and will be available in Hindi, Tamil and Telugu. The official Indian trailer also introduces the movie as a large-scale underwater adventure filled with friendship, mystery, action and fantasy.
Doraemon: Castle of the Undersea Devil Movie Trailer
The official trailer introduces a new adventure for Doraemon and his friends. Nobita, Shizuka, Gian and Suneo join Doraemon for an unusual camping trip beneath the sea. Using Doraemon’s futuristic gadgets, the group is able to explore the underwater world and experience things that would normally be impossible.
However, their fun adventure does not remain peaceful for long.
The trailer hints at the discovery of a hidden underwater civilization known as the Mu Federation. The group also encounters El, a young person connected to this underwater world. As the story develops, Doraemon and his friends become involved in a conflict connected to the mysterious Castle of the Undersea Devil.
The trailer combines colorful underwater locations with moments of humor, friendship and danger. It also gives viewers glimpses of the larger conflict that Doraemon and his friends will have to face.
The movie is officially known internationally as Doraemon: Nobita and the New Castle of the Undersea Devil. The 2026 film is a new version of the earlier Doraemon: Nobita and the Castle of the Undersea Devil story.
Watch the Doraemon: Castle of the Undersea Devil Official Trailer
The official Indian trailer gives fans a first look at Doraemon and his friends as they travel into the depths of the ocean.
The trailer focuses on the movie’s underwater setting and introduces the mystery surrounding the hidden civilization and the Castle of the Undersea Devil.
For viewers in India, the movie is being promoted in Hindi, Tamil and Telugu.
What Is Doraemon: Castle of the Undersea Devil About?
The story begins during summer vacation when Nobita and his friends are trying to decide where they should go camping.
Instead of choosing an ordinary destination, Doraemon suggests something completely different: an underwater camping trip.
With the help of Doraemon’s gadgets, the friends are able to travel beneath the ocean and explore the underwater world.
At first, the experience seems like an exciting holiday. They encounter sea creatures, explore the ocean floor and discover a world that they could never experience during a normal camping trip.
But their adventure takes a serious turn after they discover a mysterious underwater civilization.
The group eventually learns about the Mu Federation, a civilization located beneath the ocean. They also encounter El, a young man connected to this underwater society.
The situation becomes more dangerous when the group learns about Onigashima Castle, a mysterious place feared by the underwater people.
The official story information describes the adventure as a journey involving friendship, courage and the fate of the Earth.
Key story elements include:
- Doraemon and Nobita’s underwater adventure
- A unique camping trip beneath the sea
- The mysterious Mu Federation
- A new character named El
- An underwater civilization
- The mysterious Castle of the Undersea Devil
- Doraemon’s futuristic gadgets
- A battle involving the fate of the Earth
- Friendship and teamwork between the main characters
The combination of these elements makes the movie more than a simple underwater adventure. It gives Doraemon and his friends a new mystery to solve while also placing them in a much larger conflict.
What Does the Doraemon Movie Trailer Show?
The trailer gives viewers a quick look at the world that Doraemon and his friends will explore.
One of the most noticeable elements is the movie’s underwater setting. Instead of spending most of the adventure on land, the characters travel deep below the ocean and discover a completely different environment.
The trailer also shows the group using special gadgets to move through the underwater world.
There are moments of comedy involving the familiar characters, but the tone gradually becomes more serious as the mystery surrounding the underwater civilization develops.
The trailer also suggests that the Castle of the Undersea Devil is connected to the main threat in the story.
Some of the main things viewers can expect are:
- A large underwater world
The movie explores an imaginative world beneath the ocean with unusual locations and creatures. - Doraemon’s gadgets
As expected from a Doraemon adventure, futuristic gadgets play an important role in helping the group explore the underwater environment. - A new mystery
The discovery of the Mu Federation and the Castle of the Undersea Devil gives the characters a mystery to investigate. - Friendship and teamwork
Nobita, Doraemon, Shizuka, Gian and Suneo must work together as the situation becomes more dangerous. - Action and adventure
The trailer suggests that the story eventually develops into a much bigger conflict.
Doraemon: Castle of the Undersea Devil Release Date in India
Doraemon: Castle of the Undersea Devil will release in Indian cinemas on October 2, 2026.
The movie is planned as a theatrical release across India and will be available in Hindi, Tamil and Telugu.
Here are the key release details:
| Movie Detail | Information |
| Movie | Doraemon: Castle of the Undersea Devil |
| International Title | Doraemon: Nobita and the New Castle of the Undersea Devil |
| Release Date in India | October 2, 2026 |
| Country of Origin | Japan |
| Language Versions in India | Hindi, Tamil, Telugu |
| Genre | Animation, Adventure, Comedy, Fantasy |
| Director | Tetsuo Yajima |
| Runtime | Approximately 102 minutes |
| Theatrical Release | Yes |
The Japanese theatrical release took place earlier in 2026, while Indian audiences are scheduled to see the movie in October.
Doraemon: Castle of the Undersea Devil Languages
One of the important details for Indian Doraemon fans is the availability of multiple language versions.
The movie is scheduled to be released in:
- Hindi
- Tamil
- Telugu
This means viewers across different parts of India will have the opportunity to watch the underwater adventure in a language they are comfortable with.
The availability of multiple Indian-language versions also makes the movie accessible to a wider family audience.
Doraemon: Castle of the Undersea Devil Cast
The Japanese version features several familiar voice actors from the Doraemon franchise.
The principal Japanese voice cast includes:
| Character | Voice Actor |
| Doraemon | Wasabi Mizuta |
| Nobita | Megumi Ohara |
| Shizuka | Yumi Kakazu |
| Gian | Subaru Kimura |
| Suneo | Tomokazu Seki |
| El | Shoya Chiba |
The movie is directed by Tetsuo Yajima, with Isao Murayama credited as the writer.
For Indian audiences, the theatrical versions are being presented in Hindi, Tamil and Telugu. The exact Indian voice cast may vary by language version.
Who Directed Doraemon: Castle of the Undersea Devil?
The movie is directed by Tetsuo Yajima.
The 2026 film is based on the original Doraemon story created by Fujiko F. Fujio, with Isao Murayama credited for the screenplay.
The movie brings the classic underwater adventure into a new animated production while introducing it to a new generation of viewers.
Is Doraemon: Castle of the Undersea Devil a New Story?
The 2026 movie is connected to an earlier Doraemon movie from 1983, Doraemon: Nobita and the Castle of the Undersea Devil.
The new film reimagines that underwater adventure with updated animation and a new presentation. The story still centers around Doraemon, Nobita and their friends discovering a mysterious underwater world and becoming involved in a dangerous conflict.
This means longtime Doraemon fans may recognize some of the basic story elements, while younger viewers can experience the adventure as a new animated movie.
What Makes the Underwater Setting Interesting?
Doraemon movies often take the characters into unusual environments, and the ocean provides plenty of opportunities for imagination.
The underwater setting allows the movie to introduce:
- Mysterious sea creatures
- Hidden civilizations
- Underwater landscapes
- Ancient structures
- Futuristic gadgets
- Unexplored locations
- New characters
- A mysterious castle
Instead of simply placing Doraemon and his friends near the ocean, the story takes them deep beneath it.
The trailer suggests that the underwater world is an important part of the movie rather than just a background for the adventure.
Doraemon and Nobita’s Underwater Adventure
Nobita is once again at the center of an adventure that begins with something that appears to be fun.
The underwater camping idea gives the friends an opportunity to spend time together away from their normal surroundings.
However, Nobita and his friends soon discover that there is much more happening beneath the ocean.
Their encounter with the underwater civilization changes the direction of their trip. What started as a vacation becomes a mission involving people they have never met before and a threat they do not fully understand.
Doraemon’s gadgets become especially important because the group needs special equipment to survive and move around in the underwater environment.
The trailer also emphasizes the importance of the friendship between the characters. As the danger increases, they have to rely on one another rather than simply depending on Doraemon’s gadgets.
The Mystery of the Castle of the Undersea Devil
The mysterious castle is one of the central elements of the movie.
The underwater people are shown to fear Onigashima Castle, and the story gradually reveals why this location is so important.
The official story material describes the castle as a dangerous force that threatens the underwater world and eventually puts the fate of Earth at risk.
This creates the main mystery of the movie:
What is the Castle of the Undersea Devil, and why does it pose such a serious threat?
The trailer does not reveal every detail, allowing the movie itself to provide the answers.
Doraemon: Castle of the Undersea Devil Trailer Release Details
The official Indian promotional campaign has released trailer material for the movie ahead of its theatrical release.
The main Indian trailer is available in Hindi, while Tamil and Telugu trailer versions have also been promoted for the Indian theatrical release.
The trailer is relatively short but provides an introduction to the characters, underwater setting and central conflict.
Trailer highlights include:
- Doraemon and Nobita’s underwater journey
- Shizuka, Gian and Suneo joining the adventure
- The underwater camping concept
- New underwater locations
- The Mu Federation
- El and the underwater people
- The mysterious castle
- Action sequences
- A larger threat involving Earth
Doraemon: Castle of the Undersea Devil Movie Genres
The movie combines several genres rather than focusing on only one type of storytelling.
| Genre | What It Adds to the Movie |
| Animation | The colorful visual world and character design |
| Adventure | The underwater journey and exploration |
| Fantasy | The fictional underwater civilization and mysterious castle |
| Comedy | Humor involving Doraemon and his friends |
| Family | A story designed for children and families |
| Action | The conflict surrounding the underwater threat |
This combination is typical of the larger Doraemon movie format, where a simple adventure gradually develops into a much bigger story.
Is Doraemon: Castle of the Undersea Devil Suitable for Families?
The movie is an animated adventure featuring Doraemon and his familiar group of friends.
Its story includes humor, fantasy, friendship, exploration and action, making it suitable for a broad family audience. The movie’s Indian theatrical release in Hindi, Tamil and Telugu also makes it accessible to different audiences.
Parents who grew up watching Doraemon may also find the new movie interesting because the 2026 film is connected to an older Doraemon adventure.
Doraemon: Castle of the Undersea Devil – What to Expect
Based on the trailer and available story information, viewers can expect an adventure that combines Doraemon’s familiar humor with a larger fantasy storyline.
The first part of the story appears to focus on exploration and the excitement of traveling beneath the sea.
As the characters discover the Mu Federation and learn about the Castle of the Undersea Devil, the adventure becomes more serious.
The movie is therefore likely to move through several stages:
Fun underwater trip → mysterious discovery → new friendship → growing danger → major adventure
The trailer keeps much of the story’s biggest mystery hidden, which allows audiences to discover the full adventure when the movie arrives in cinemas.
Doraemon: Castle of the Undersea Devil FAQs
When is Doraemon: Castle of the Undersea Devil releasing in India?
The movie is scheduled to release in Indian cinemas on October 2, 2026.
Is the Doraemon: Castle of the Undersea Devil trailer released?
Yes. The official trailer has been released, with an Indian Hindi trailer available ahead of the theatrical release. Tamil and Telugu versions have also been promoted.
In which languages will Doraemon: Castle of the Undersea Devil release in India?
The movie is scheduled to release in Hindi, Tamil and Telugu in India.
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Final Thoughts
Doraemon: Castle of the Undersea Devil takes Doraemon and his friends into one of their most unusual environments: the world beneath the ocean.
The official trailer introduces an adventure involving underwater exploration, a hidden civilization, new characters and the mysterious Castle of the Undersea Devil. The story begins with a simple camping trip but gradually turns into a much bigger mission involving the fate of the underwater world and Earth.
For Indian Doraemon fans, the movie is especially notable because it is scheduled to arrive in cinemas on October 2, 2026, with Hindi, Tamil and Telugu versions.
The 2026 movie also gives the classic underwater adventure a new animated presentation, making it possible for longtime fans and a new generation of viewers to experience the story together.
As the theatrical release approaches, Doraemon fans can look forward to discovering what lies beneath the ocean and what secrets are hidden inside the mysterious Castle of the Undersea Devil.
Doraemon: Castle of the Undersea Devil releases in Indian cinemas on October 2, 2026.