Based on the story by manga master Leiji Matsumoto (The Cockpit, Queen Emeraldas), the 55 minute featurette picks up one year after the events of Galaxy Express 999 in which a young boy named Tetsuro and his motherly companion Maetel worked to rid the universe on the Mechanized Empire who had taken over Earth. (Source: AniDB)

A remake of episodes 12-13 of the TV version.

The alien Wulgaru's last assault against humanity was foiled by the heroic actions of the genetically enhanced humans known as the Evolved Children in their advanced AHSMB battle armor, but now a new attack has been launched against Earth under an even deadlier champion, Diorna, created from the fusion of DNA from two Wulgaru Royals. Unfortunately, Izuru Hitachi, the leader of Team Rabbits who defeated the Wulgaru Royal Jiart, is still out of action and recovering, so the task of marshalling the Majestic Princes and stopping Diorna falls upon the unready shoulders of Toshikazu Asagi. Together with the remaining members of Team Rabbits and the recently created Team Fawn, it’s up to Asagi to hold the line against the most ruthless adversary yet. (Source: Anilist)

600 years after Ginga Senpuu Braiger, Jupiter has been destroyed, and many planets have come from it, bringing about more colonization. To combat the increasing lawless activity, Don Diego Condor gathers Billy the Shot, Samanosuke Dodi, Layla Minesato, and Shuteken Radcliffe, a.k.a. J9-II. They pilot Cosmo Bikes, which combine into the robot Baxingar. (Source: ANN)