One of the most treacherous weather events to hit the United States, Hurricane Sandy has affected millions. But how did this so called "frankenstorm" become so powerful? Using on-the-ground expert analysis and CGI and satellite imaging, Curiosity explores how distinct phenomena combined to create the perfect storm and how we can prepare for the next one. The episode also takes viewers inside the storm via on-the-ground camera and smartphone footage from Sandy survivors. Watch as they share their stories, some narrowly escaping the megastorm, and recount what it was like as Sandy engulfed their city.