A Doraemon anime film. It premiered in theatres on March 9, 1991 on a bill with Doraemon: Nobita in Dorabian Nights. The movie's original plot was written by Hiroshi Fujimoto and Motoo Abiko.

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.

A young panda prince is found unworthy by his mother the Queen, and expelled from the forest. In his journey, he battles dangerous enemies and gets captures and forced to work in a circus.

Cheerful Mimiko has a wonderfully strange family—a Panda for her Papa; and his son Panny, calls her Mom! When Panny follows Mimiko to school, he must pretend to be a teddy bear so Mimiko won't get into trouble. Despite his efforts to behave, Panny causes trouble in school and now the school is after Panny! Then, Panny makes a new friend, Tiny, a baby tiger who's wandered off from the circus.