Twenty thousand years before the creation of mankind, two tribes-Plazmans and Sazorions-came to the earth. The bellicose Sazorions tried to conquer the peaceful Plazmans using the dreadful power of the Scorpio in outer space. Twenty thousand years later-at some time in the future-Dr. Godo, the only survivor of the Plazmans, secretly prepares Ginguiser, the combined magic robot troop, to defend peace in the event that the Sazorions are revived. Dr. Godo commands four brave young men to acquire occult super powers. Each episode of this series features a sequence of fabulous and fantastic battles. These scenes cannot fail to arouse the interest and excitement of the audience, and will be certain to catch every eye. (Source: Nippon Animation)

These three specials came with the DVD release. They mostly depict stories that take place in-between episodes from the main series. Special #1 takes place in-between episodes 2 and 3. Special #2 takes place in-between episodes 3 and 4. Special #3 doesn't fit very well in-between any of the main series, and is more of a side-story.

By 2030, Shotaro's son was in charge of Tetsujin-28. An Interpol agent like his father, he used the aged robot to combat the Pink Mafia and the Franken organization. (Source: AniDB)

In the year 2062, the world's two superpowers are fighting a long and brutal war. In a desperate attempt to win, pilot Kei Katsuragi is given the mission to detonate a super weapon called the Space/Time Oscillation Bomb. The bomb explodes but the results are completely unexpected: a multitude of dimensions, times, and realities are unleashed into the world. Can Kei reverse the effects and bring life back to normal? (Source: ImaginAsian Entertainment)