8 minutes, 35 mm, colour, 1978
Classical cartoon animation Audience: family Commentary: off screen
Producer: KF a.s. - Studio Bratri v triku Director: M+B+D (Macourek, Born, Doubrava) Designer: Adolf Born
The forth episode of the "Mach And Sebestova" series. The schoolmates from the third "B" class with the help of their magic receiver make themselves so small such that they can bravely fight the bacilli in their schoolmate's - Kropacek's - throat.