There are still water spirits among us. One group lives in Prague, led by Mr. Wassermann, who is using his wife's family as a servants. All they need is their old house near the river. But the house is to be demolished. They have to stop it. And the only way is to drown Dr. Mrácek, who is responsible for the demolition. But he falls in love with Wassermann's niece Jana. He changes to fish, is mistaken for water spirit from Germany, is drowned and revived again. The other problem is the flour with ears... and so on...
Libuše Šafránková
Jana Vodičková
Jaromír Hanzlík
JUDr. Jindřich Mráček
František Filipovský
správce půjčovny loděk, Bertík Vodička
Miloš Kopecký
hlavní český vodník Wassermann
Vladimír Menšík
Karel Vodička, plavčík
Zdeněk Řehoř
potápěč Alois Vodička, Janin otec
Stella Zázvorková
doc. Mráčková, Jindřichova matka
Eva Trejtnarová-Hudečková
Polly, Wassermannova dcera
