Unnatural Selection - Episode Guide

Gene-editing technologies promise to eliminate diseases, and biohackers push for access while scientists grapple with formidable ethical questions.

New gene therapies may change the lives of Jackson, Nick and Tristan. But on this risky frontier, nothing is guaranteed, and the price can be steep.

Using gene drive technology, humans have the chance to shape -- and eradicate -- whole species. But the implications alarm bioethicists and activists.

As Jackson gets ready for surgery, Maria and Victor await their "three-person baby" at a Ukrainian clinic that uses pronuclear transfer technology.