Nobita and his friends under the waters of the Pacific Ocean. Gian and Suneo take Doraemon's underwater vehicle and travel through the Atlantic Ocean, trying to find a treasure ship. Along the way, they discover that the environment gun that Doraemon used to protect them is running out of energy leaving them vulnerable to the sea. Fortunately, they are rescued by some marine creatures.
Unfortunately the movie Doraemon: Nobita and the Castle of the Undersea Devil is not yet available on HBO Max.
| Directing | Tsutomu Shibayama | Director |
| Visual Effects | Yoshimasa Iiyama | Key Animation |
| Visual Effects | Katsuhiko Yamazaki | Key Animation |
| Visual Effects | Takahisa Ichikawa | Key Animation |
| Visual Effects | Masami Otsuka | Key Animation |
| Visual Effects | Yoshiji Kigami | Key Animation |
| Visual Effects | Shinichi Suzuki | Key Animation |
| Visual Effects | Masako Goto | Key Animation |
| Visual Effects | Keisuke Morishita | Key Animation |
| Writing | Fujiko F. Fujio | Comic Book |
