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".
as X1
as X4
as X3
as X2
as Matilde Bernabei
as Lo scrittore di fantascienza
as Socio dello scrittore
as Cameriere d'Hotel
as Cameriera d'Hotel
as Se stesso
as L'editore
as Tifoso di calcio
as Ambasciatore austriaco
as Lo sposo
as Passante che parla con X1
as Segretaria dell'editore
as Professore di matematica
as Sottosegretario esteri
as La sposa
as Frida, cantante lirica
as Marito geloso
as Ragazza in bikini
as Ragazza francese
as Figlia del contadino
as Il protettore di prostitute
as Ragazza in bikini
as Salumiere
as Tifoso allo stadio
as Ragazza asiatica
as Contadino abruzzese
as La Grande Mente (voice)
as Segretario dell'ambasciatore
as Venditore di bibite allo stadio (uncredited)
as Narratore (uncredited)
as Party Guest (uncredited)
