Good and Evil Clash In `Mortal Kombat,’ which topped weekend movie sales with $23 million

The producers of “Mortal Kombat” know that the strength of their movie is based on the actors’ abilities to execute awesome roundhouse kicks, not soliliquies. So it’s not surprising that the sci-fi action-adventure, which opened Friday and totaled $23 million nationwide over the weekend, is heavy on fight scenes, low on plot.