Non-consensual deepfake porn is becoming increasingly pervasive, and it didn’t just come out of nowhere. These deepfakes were created and curated by people, on platforms, inside online subcultures. And they were allowed to spread, while governments dragged their feet, tech companies shrugged, and the targets — almost always women — paid the price.

Tech journalist Sam Cole has been covering deepfake porn since its inception. In this season of Understood, she follows the trail all the way to the source, tracing an investigation across three countries and four newsrooms into the very real person behind the world’s largest deepfake porn website: Mr. Deepfakes himself.