Ep. 1: Kouji Kabuto and Duke Fleed

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Kouji Kabuto tries his TFO made of Chogokin. When flying, he is attacked by the UFOs of Vega. Fortunately Duke Fleed arrives on time to save the day (but not too quickly nonetheless). Kouji does not actually know that Duke Fleed is the prince of Fleed. (Source: AniDB)