Giant Robo  

Giant Robo Prologue-hen, GR: Giant Robot Pilot, ジャイアントロボ

The gr: giant robo pilot had substantial differences from the final product, such as changes in writing and direction. as a result, the special serves more as an alternative vision of what the show could have been rather than a promotional material for the series.

The pilot was included on the GR: Giant Robo Millennium Box Set release.