seven-headed mouse king

(...) Mice begin to come out from beneath the floor boards, including the seven-headed Mouse King. Marie, startled, slips and puts her elbow through the glass door of the toy cupboard. The dolls in the cupboard come alive and begin to move, Nutcracker taking command and leading them into battle after putting Marie's ribbon on as a token. The battle at first goes to the dolls, but they are eventually overwhelmed by the mice. Marie, seeing Nutcracker about to be taken prisoner, takes off her shoe and throws it at the Mouse King, then faints.

Marie wakes the next morning with her arm bandaged and tries to tell her parents about the battle between the mice and the dolls, but they do not believe her, thinking that she has had a fever dream caused by the wound she sustained from the broken glass. Drosselmeyer soon arrives with the Nutcracker, whose jaw has been fixed, and tells Marie the story of Princess Pirlipat and the Queen of the Mice, which explains how Nutcrackers came to be and why they look the way they do...

THE NUTCRACKER, wikipedia