ávštěvníci is a Czechoslovak sci-fi TV series filmed between 1981 and 1983 by Czech director Jindřich Polák. The 15 parts were co-produced with television-companies of the Federal Republic of Germany, Switzerland and France. As an additional 16th part for Germany a "Making Of" was produced under the title "Besuch bei den Besuchern". In West-Germany the series got the title Die Besucher, in the German Democratic Republic it was called Expedition Adam 84.

Overview from themoviedb.org