Sibling astronomers join forces with the military when hostile aliens attack Earth.

Earthquakes cause a massive polar vortex that covers most of the planet, a family must make their way to a safe zone at the equator.

Dozens of great white sharks attack the sleepy coastal town of Goldcoast, CA, resulting in several deaths and forcing the town council to bring in a group of marine biologists…

As mass of solar storms causes tsunamis, volcanoes, and flooding, a city-dwelling family attempts to flee to the relative safety of a group of high-elevation caves several miles away.