If you were born in the late 1980s, or live with under-12s, chances are that you’re aware of a LEGO universe called Ninjago – where a bunch of undisciplined teenagers train as secret ninja warriors under the tutelage of a white-bearded Sensei Wu (voiced by Jackie Chan), whose appearance is a dead ringer for Kill Bill’s Pai Mei. And even if you were not aware of Ninjago…