Watch Iron Princess for Free: How to Stream the Movie Online at 123Movies. . A musical fairy tale film for children about how important it is to protect the heart from indifference and laziness and reveals a modern problem: in order to change something, you must, first of all, rebuild yourself. In this, the heroes of the fairy tale are helped by a wise, kind Dwarf who fights Rust and Mold who tries to own the thoughts and feelings of children.