Ep. 1: Passado de Pichu e Jornada de Evolução de Pikachu Revelados no Prequel

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In this prequel episode, Pikachu's backstory as a Pichu, his being cared for by a Kangaskhan after falling off a cliff, and the events leading to his evolution into a Pikachu and eventually meeting Ash are revealed. • Note: In this episode, Hana Takeda voices young Ash Ketchum, Kei Shindou voices Goh, and Ikue Ootani voices Pichu. In the English dub, they are voiced by the same actors that voice their more grown-up counterparts aided by some technical tweaking. (Source: Wikipedia)