O desenho se passa com 3 jovens: Hugo, Silvio e Alice e o cachorro Elmo.
Enquanto tentavam fugir de uma tempestade, os jovens entram em uma casa velha e veem um relógio antigo.
Quando acertam o horário do relógio para meia-noite, libertam dois fantasmas: um com traje de revolucionário chamado Jonathan Wellington "Mudsy" Muddlemore e seu gato, Boo.
Os dois relatam estar presos desde a Guerra Revolucionária nos EUA, contra a Inglaterra, e não puderam sair, daí acabaram morrendo lá dentro.
Libertados pelos novos amigos, Fantasminha e Boo os acompanham em muitos mistérios sempre dando uma ajuda invisível.
Aproveite o melhor do Filmow sem interrupções
/media/movies/covers/2014/06/fantasminha-legal_t34668.jpg "Poster 1 de Série Fantasminha Legal (1971)")
/media/movies/covers/2013/03/b1d2b68cb1c1fe4429ec1f1f441f2fe6.jpg "Poster 2 de Série Fantasminha Legal (1971)")
/media/movies/covers/2011/05/db3fb5e15e28922ea1334987a55d2188.jpg "Poster 3 de Série Fantasminha Legal (1971)")
/media/movies/covers/2011/06/3cd7bed3973d99e7fbc90d66670b072d.jpg "Poster 4 de Série Fantasminha Legal (1971)")
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