Mystery of the Land of Wild Strawberry (1973)

The boy Deniska and his girlfriend Lariska run away from the pioneer camp to pick berries. On the way, someone steals a compass from them. In pursuit of the kidnapper, they fall into the Land of Strawberries, where they made friends with the boaster Kuzka and the underbelly Kiv. It turns out that the compass was pulled by One-mustached man. Telltale Mukha informs One-mustached man about the appearance of strangers in the Country, and hooligans (the One-mustached army) bind the pioneers and put them in a dark pit. But those who endear themselves to several local children, defeat the evil One-mustached, who wanted to turn all children into boasters, sneaky, telltales, and hooligans.