Episode 2 (S01E02)

As the Triffids wreak havoc across Britain, Bill collaborates with his father to create a genetic mutation aimed at sterilizing the relentless creatures. Meanwhile, Bill's hopes for a future with Jo are shattered by the arrival of Torrence, who comes from a London that has fallen to the Triffids. To find safety, they must navigate the perilous path between Torrence and the deadly plants.