The cartoon takes place in a fictional country of Metals, where due to the financial crisis, the king was forced to dissolve the army. Taking advantage of this, the power in the Kingdom was seized by the chief of police. Not wanting to see how the state under the rule of the new king, Rusty (Christoph Maria Herbst) and his friends decide to save their Metallome.

«Brave heart. Conspiracy in the Kingdom "- German full-length adventure animated film by Thomas Bodenstein and Marcus Hamann, the continuation of the cartoon 2013 "brave heart".