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.
Source: MyAnimeList
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Curated recommendations for fans of Giant Robo.
Other anime produced by OLM.
Top-rated mecha anime ranked by score.
Chronological viewing order for franchises with movies and OVAs.
Streaming platforms and availability for popular anime.
Where to start reading once an adaptation ends.
