Not quite in the class of the first film, Underworld 4 is still the most enlightened girl-power film of the week, nosing out Gina Carano's "Haywire" by the length of Pinocchio's proboscis.
The entire production is single-mindedly, earnestly devoted to serving up feats of BADASS, and it succeeds in this devotion to the exclusion of everything else. Allegedly in 3-D, though I didn't notice at the time.
Why are they fighting again? Never you mind. Just sit tight till the next action sequence (it won't be long), and get ready to laugh - with equal parts scorn and fanboy joy - as Beckinsale strikes another Rodinesque pose under a slo-mo shower of inhuman innards.
There's not much to this movie beyond a slick procession of dark, gleaming violence. But Selene lovers would pay good 3D money to see her fight a parking ticket.