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As Gero was not introduced to the series until five years later in Dragon Ball Z, a filler episode of the Dragon Ball anime established that the scientist Dr. Flappe was the inventor of Android 8. The fact that Flappe does not appear in Akira Toriyama's manga work, nor is he mentioned as the creator of any android models in Dragon Ball Z, coupled with the fact that Toriyama was in fact involved in the production of anime filler material, makes it difficult to identify exactly who designed Android 8. To compromise for this, there have been suggestions that both Gero and Flappe created Android 8 as a joint effort. Another possibility is that Android 8 came from a totally different line of Red Ribbon Androids, and so would not have been included.
Android 17 asserts during the Androids Saga of Dragon Ball Z that Dr. Gero destroyed the first fifteen Androids he designed, however this disturbs the canonicity of both the mainstream series (as Android 8 makes cameo appearances throughout both Z and Dragon Ball GT) and Super Android 13!, which features Androids 13, 14 and 15 as its lead villains and provides an original explanation that Dr. Gero was murdered by Android 17 and 18 prior to personally completing 13 through 15 (leaving an underground supercomputer to finish the models posthumously).
Dragon Ball: The Path to Power
Son Goku meets a girl called Bulma who is looking for the mystical Dragon Balls. The Red Ribbon Army is also out looking for them ...