Undersea Super Train: Marine Express (海底超特急 マリン・エクスプレス, Kaitei Chōtokkyū Marin Ekusupuresu) is an anime television film created for the Nippon Television Network's annual 24-hour charity program, Ai wa Chikyū o Suku, which roughly translates to "Love Saves the Earth".
To coincide with the central theme of the charity program, the film emphasized on the dangers of environmental destruction, and that such disasters can be overcome by banding together.
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.
Traveling on a rail through large glass tunnels, the train is capable of taking passengers from Los Angeles, California to Japan.
Originally, he had been hired by the Chief Engineer of the Marine Express to investigate a possibility that someone was going to try and use the train for illicit means.
In the firefight, Doctor Narzenkopf is critically wounded, forcing Black Jack to do immediate brain surgery.
The Doctor created Adam to do this because he feared what the Marine Express would do to the ocean ecology and couldn't stand to see its results.
Adam, however, has begun questioning his own existence, knowing that he is a robot, and designed for the sole reason of destroying the train.
Only Shunsaku Ban returned to the present, people on an island say what happened was a dream and everyone died on the Marine Express, but a carving on a nearby rock proved the experience to be real.
In the hospital, his bullet wound is treated and Shunsaku is all set to leave when he sees a television program announcing the test-run of the new Pan-Pacific Undersea Super Train, the Marine Express.
Dashing out of the hospital, Shunsaku races to the train and boards it, with the doctor that had just treated him in tow since he hadn't paid his medical bill yet.
Knowing that he is built for the sole purpose of destroying the train leaves Adam conflicted, though he eventually fulfills his role in the end to defeat Sharaku.