Five young people take off in a lighter-than-air machine at the Prague Centennial Exhibition. A live-action/animated film based loosely on Jules Verne's novels Two Years' Vacation and The Mysterious Island. The film in Art Nouveau style consists of live-action scenes, generally shot in black and white, as well as hand-drawn, stop-motion, and cutout animation. Various live-action and animated elements are often composited into the same scene.

Michal Pospíšil
as Jakoubek Kurka

Hanuš Bor
as Tomáš Dufek

Jan Čížek
as Martin

Josef Stráník
as Pavel

Jan Malát
as Petr

Jitka Zelenohorská
as Katka

Čestmír Řanda
as Findejs

Stanislav Šimek
as Editor Ardan

Josef Větrovec
as kapitán

Jan Teplý
as Walstone