The two main characters are: Filemon, a little white kitten, young and naïve; and Bonifacy, an old, serious black tomcat.
Other characters are: the Grandmother, the Grandfather, the Puppy, a fox, mice, 'monsters from the attic', and other creatures.
The cartoon is rich in elements of Polish folk legends and traditions.
The series was created by Marek Nejman, a Polish screenplay writer, and produced by animation studio Se-ma-for in Łódź, Poland.
Up to the 13th episode the series was called Dziwny świat kota Filemona (The strange world of Filemon the Cat).
Something for a sound sleeper (Sposób na twardy sen)– Ryszard Szymczak 11.
Noises in the wardrobe (Co w szafie piszczy) – Wacław Fedak 19. Who does not work (Kto nie pracuje) – Ireneusz Czesny 20.
Like cat and dog (Jak pies z kotem) – Alina Kotowska 21.
A cat in a bag (Kupić kota w worku)– Andrzej Piliczewski 26.