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Ten-year-old Janek has a vivid imagination. He constantly makes things up and imagines himself as a superhero. When the demonic Utopiec replaces his older sister with the repulsive Podciep, no one believes him. To make matters worse, his parents send the sad and frightened boy on holiday to Silesia. Janek decides to rescue his sister from the world of demons, and his greatest ally turns out to be his eccentric great-grandfather, Marcin, a former miner.
as Janek
as Zosia
as Bartek
as Great-grandfather Marcin
as Grandmother Helenka
as Janek's Mother
as Utopiec
as Janek's Father
as Piwosznik
as Skarbek/Szarlej
as Latawiec
