The provided sources for *Undersea Super Train: Marine Express* detail characters including Shunsaku Ban, Black Jack, Rock, Adam (Astro Boy), Milly (Chocola), Dr. Nazenkopf (Professor Ochanomizu), Duke Red (Director Credit), Skunk Kusai, Acetylene Lamp, Kojiro Sasaki, Sharaku, Don Dracula (Dondora), and Empress Sapphire. These sources encompass character lists, plot summaries, cast details, and critical analyses. No references to a character named Dewey appear within this documented material.