People are dying in South Wales, and UNIT has discovered that each victim's eyeball has a puncture wound from a hypodemic needle. To investigate, they've sent Torchwood their newest recruit: Martha Jones, now a fully-fledged doctor. Together, they learn that several of the dead had recently recovered from normally incurable illnesses after participating in trials of a mysterious drug called Reset. Reset is a product of the Pharm, a secretive facility run by the arrogant Dr Aaron Copley. But Copley is protected by powerful friends, so Martha agrees to infiltrate the Pharm undercover -- as a Reset test subject.