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".
Videos
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Paolo Panelli as X1
Carlo Croccolo as X4
Enzo Garinei as X3
Alfredo Landa as X2
Magali Noël as Matilde Bernabei
Ciccio Ingrassia as Lo scrittore di fantascienza
Franco Franchi as Socio dello scrittore
Pietro De Vico as Cameriere d'Hotel
Valeria Fabrizi as Cameriera d'Hotel
Nando Martellini as Se stesso
Umberto D'Orsi as L'editore
Riccardo Billi as Tifoso di calcio
Francesco Mulè as Ambasciatore austriaco
Lando Buzzanca as Lo sposo
Mario De Simone as Passante che parla con X1
Margaret Lee as Segretaria dell'editore
Tullio Altamura as Professore di matematica
Nerio Bernardi as Sottosegretario esteri
Dominique Boschero as La sposa
Alicia Brandet as Frida, cantante lirica
José Calvo as Marito geloso
Eva Darin as
Thea Fleming as
Agata Flori as Ragazza in bikini
Jenny Folchi as
Corinne Fontaine as Ragazza francese
Cristina Gaïoni as Figlia del contadino
Aldo Giuffrè as Il protettore di prostitute
Annie Gorassini as Ragazza in bikini
Margaret Rose Keil as
Salvo Libassi as Salumiere
Rosemarie Lindt as
Mimmo Poli as Tifoso allo stadio
Lucia Modugno as
Bruno Scipioni as
Seyna Seyn as Ragazza asiatica
Alfredo Tasso as
José María Tasso as
Elena María Tejeiro as
Ángel Ter as
Pietro Tordi as Contadino abruzzese
Renato Turi as La Grande Mente (voice)
Max Turilli as Segretario dell'ambasciatore
Raimondo Vianello as
Jimmy il Fenomeno as Venditore di bibite allo stadio (uncredited)