'Mars Needs Moms' needs stronger story

LOS ANGELES: Robert Zemeckis' performance capture system, which turns life-action into animation, gets quite a workout in Disney's "Mars Needs Moms," which opens on Friday.Its characters, both human and Martian, tumble through space, slide down chutes, chase along corridors that turn every which way and dance around mountains and into caverns created out of huge mounds of trash. The process has