In a world inhabited by animals, a theater run by a koala bear Buster Moon (Marcin Dorociński) falls into trouble. Loving theater, Buster will do everything to save him. The last chance to survive is a great competition, which will help to find the most beautiful voice in the world. A voice that will save the theater. The competition will m.in .: confident and very talented mouse Mike (Yankee), busy mother of 25 piglets - guinea Rosita (Małgorzata Socha), a young gangster with a big voice - Johnny (Adam Zdrojkowski), Ash (Ewa Farna) - rebellious , punk jeżozwierzyca and true stage animal - pig Gunter (Jaroslaw Boberek), as well as a shy elephant with a big voice - Meena (Catherine Sawczuk). They will appear at the hearings, believing that competition announced by the director of the Moon is their chance for success and a dream come true. The better Buster exploring the contestants and their great talents, the faster it comes to the conclusion that perhaps not only the theater is something to be saved.
In the film, we hear over 65 big hits - in the original version.