You’re at Union Station when the big one hits. The next two minutes are terrifying. By the time you make your way outside, the Los Angeles you know is gone. In Episode One, you experience what the first hours after a massive earthquake could be like.

No car, the trains are down, the road's a mess and you need to get home. In this episode, you walk 15 miles back to your house through a city that feels unrecognizable.  

A polar bear killer, a Sputnik-inspired scientist, a man who uses the past to see the future and seismologist Lucy Jones. What do they all have in common? Without them, we wouldn’t understand the what, when, why and how of the big one. 

You wake up in a city that feels unfamiliar and watch as neighbors choose to hunker down or head out. The aftershocks are unrelenting and you are almost out of clean water. Will you stay or will you go? 

After the big one, the Los Angeles economy will be shook. Hollywood might be too big to fail but what does an economic hit like this mean for you? 

The Buildings Every day when you walk into work you assume your building is safe. What if it's not? We try to get answers about two 52-story towers in downtown L.A. built using construction methods that structural engineers no longer use. 

After six months of research, Jacob finally makes an earthquake kit and ends up asleep outside in the rain on Christmas Eve. 

In this episode, a rat learns to skateboard and we learn how our brain processes (or doesn't) the idea of a big one.