Ten-year-old David joins a sailing club. He trains hard and helps repair the sailing boats, but people have to take turns actually sailing. The club chairman Vala wants David to sail with his son Olda. Olda's previous team mate Béda has grown too fast, but with little David Olda could win a place on the regatta to Finland. Olda is arrogant and accustomed to winning with little effort; he bullies David and calls him "Greenhorn". He makes David his servant and blames him when things go wrong.

Viktor Král
as David Kubicek

René Bílek
as Olda Vala

Ivan Vyskočil
as Kocour

Alois Švehlík
as Vala

Jiří Havel
as

Slávka Španková
as

Miroslav Švejda
as

Pavel Jiras
as

Daniela Šrajerová
as

Renáta Doleželová
as