It sounds like you're referring to a Portuguese-dubbed or subtitled version of an anime or animated series, likely "Conan, the Boy in Future" (original Japanese title: Mirai Shounen Conan), directed by Hayao Miyazaki and first aired in 1978.
It’s a post-apocalyptic adventure anime based on Alexander Key’s novel The Incredible Tide. The Portuguese dub (European Portuguese) is well-known among Portuguese anime fans for its nostalgic value, having aired on RTP in the 1980s–90s. conan+o+rapaz+do+futuro+portugues+26+episod+full
Released in 1978, this 26-episode series is a cornerstone of animation history. It was the first major project directed by Hayao Miyazaki It sounds like you're referring to a Portuguese-dubbed
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Rating: 10/10 (Classic)