Scientists make a horrible discovery The Big One is coming in two days, with it, California will sink to the ocean. Their only hope is to rupture a volcano that will displace the earthquake's energy and build a new crust on the surface. But as foreshocks turn California into chaos, it's a race against time the scientists might not win.
When the hospital she works at is transported to the moon, medical student Martha Jones joins forces with The Doctor to hunt down an alien fugitive before the oxygen runs out