Well, knock me down and step on my face! The DC Universe has finally lightened things up from all that deep, Batman v Superman dourness. In this entertaining romp, a streetwise 14-year-old orphan (Asher Angel) is given the power to transform, by uttering one magic word, into a grown-up superhero (Zachary Levi) with all kinds of fun powers. If this sounds to you like a riff on Tom Hanks’ 1988 Big, you’re not alone. Look for a nod to that movie in a toy store scene. Unpretentious, grounded, nicely cast and a good message about family. It also doesn’t hurt to have Mark Strong play the supervillain. (132 min)