The Nutcracker and the Four Realms

Benjamin becomes angry at Clara for refusing to dance with him, and they insult each other. Clara finds a string with her name on it, signifying her gift, and follows it into a forest in a parallel world where she sees a key. Before she can grab it, a mouse snatches it and crosses a frozen river.

Captain Philip Hoffman, the Nutcracker, leads Clara across the bridge into the Fourth Realm, where they barely escape the mouse king and Mother Ginger, the regent of the Fourth Realm.