If you are not a child, or do not have children yourself, you may find the mere title of The Lego Ninjago Movie to beg some kind of explanation. I’ll do what I can. Ninjago, which I have been mistakenly pronouncing “ninja-go” for the past month, is a series of Lego sets that began production in 2011. The theme is a kind of blenderized mix of martial arts and mecha imagery; basically Power Rangers without elbow or knee joints. There are robots in the Ninjago universe, but there are also dojos, where the Japan-via-Denmark art of “Spinjitzu” is taught. I was somewhat scandalized to discover that there are actual characters in the Ninjago universe, namely the five ninjas that fight the evil warlord Garmadon, a kind of cross between a samurai and a Japanese oni beast.