If a video doesn't load or shows an error, switch to another server or audio track above. Playback is provided by third parties.

ジャイアントロボ プロローグ編
The pilot for GR: Giant Robo. However, there were significant changes between the pilot and the actual show, including a different writer and a different director. Thus, the special is less a promo for the series than an alternate version of how the series might have looked. Included in the GR: Giant Robo Millennium Box DVD Set.