The plot of Marine Express can be described in two parts. The first part focuses on the people boarding the train and the problems they encounter on it. The second part takes place after the train has stopped at its half-way point, an island that used to be home to an ancient civilization millennia ago and has its fair share of secrets.
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| Directing | Satoshi Dezaki | Director |
| Sound | Yuji Ohno | Original Music Composer |
| Production | Michitoshi Shimakata | Executive Producer |
| Art | Mitsunari Makino | Art Direction |
| Visual Effects | Osamu Tezuka | Character Designer |
| Production | Akira Yoshikawa | Producer |
| Visual Effects | Shigetaka Kiyoyama | Animation Director |
| Editing | Hiroshi Shinohara | Color Timer |
| Production | Tadahiko Tsuzuki | Producer |
| Writing | Osamu Tezuka | Story |
| Art | Nao Sakaguchi | Settings |
| Editing | Kazuo Inoue | Editor |
