In the irreverent spirit of fun that made �The Lego Movie� a worldwide phenomenon, the self-described leading man of that ensemble�Lego Batman�stars in his own big-screen adventure. But there are big changes brewing in Gotham, and if he wants to save the city from The Joker�s hostile takeover, Batman may have to drop the lone vigilante thing, try to work with others and maybe, just maybe, learn to lighten up.