Kyuutai Panic Adventure! — a special crossover between Dragon Ball Z, One Piece and Astro Boy that aired in 2003 in Japan as a interactive feature in a public event hosted by Fuji TV called Odaiba Boken-Oh.

Kyuutai Panic Adventure Returns! — a special crossover between Dragon Ball Z, KochiKame and One Piece that aired in 2004 as a sequel for Kyuutai Panic Adventure!

Source: Dragon Ball Wikia

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