Návštěvníci (The Visitors) is a Czechoslovak sci-fi TV series filmed between 1981 and 1983 by Czech director Jindřich Polák.
As an additional 16th part for Germany a "Making of" was produced under the title "Besuch bei den Besuchern" (Visiting the Visitors).
In West Germany the series got the title Die Besucher (The Visitors), in the German Democratic Republic and Australia it was called Expedition Adam 84.
In his memoirs Bernau tells about a formula to move continents and even worlds; he had written it before or after a house fire on his eleventh birthday in three notebooks, which have not been preserved.
Unfortunately, the memoir abandons the theme of world-shifting in favor of describing a "silly love" for the girl Ali, as Filip laments.
Their time-travel apparatus is housed in a contemporary-looking Lada Niva; they pose as surveyors surveying the area for a road to be built.
In Kamenice, the expedition meets not only young Adam, a curious rascal, but also his strict and narrow-minded parents, schoolmate Ali, and naive but practical outsider Alois Drchlík.
In the end, the visitors are unable to seize any of the three notebooks and travel back disappointed before the real surveyors arrive in Kamenice.
The series has been released in several other European countries, including Hungary, Yugoslavia, Poland, Romania, Bulgaria, and Spain.