Four extraterrestrials, X-1, X-2, X-3 and X-4, arrive on Earth in the early sixties. Here they decide to take on human features to study the terrestrials incognito, but end up getting involved in the Roman "dolce vita".
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Verdict: Unknown
> Castellano (Director)
> Pipolo (Director)
> Sinesio Isla (Second Assistant Director)
> Emilio P. Miraglia (First Assistant Director)
> Alfio Contini (Director of Photography)
> Marcello Pandolfi (Second Assistant Director)
> Castellano (Story)
> Castellano (Screenplay)
> Pipolo (Story)
> Pipolo (Screenplay)
