A series of unexplained deaths attracts the attention of both Torchwood and UNIT, resulting in a rare collaboration. UNIT loans out its new medical officer, Dr. Martha Jones, to Torchwood – and the rest of Torchwood seems terribly surprised when Martha and Jack seem to go back a long way. But even more troubling is the evidence Martha finds during the autopsy of the latest victim – a needle mark in his eye, and a substance in his bloodstream that she thinks is erasing medical evidence. Another victim turns up, alive, but shortly before she dies, she tells Martha and Owen that she had previously had HIV, but that it was miraculously cured by a drug called Reset that she took as part of a clinical trial. When she dies, insects erupt from her open mouth, and then die just as suddenly. They turn out to be of alien origin, but the organization conducting human trials of Reset is keeping everything very hush-hush – and they’re aware of Torchwood’s investigation. Martha volunteers to pass herself off as a new clinical test subject, but even with Jack and his team backing her up, she may be in over her head – and getting her out of danger turns out to be a deadlier endeavour than usual.
Guest Cast: Freema Agyeman (Dr. Martha Jones), Alan Dale (Copley), Jacqueline Boatswain (Plummer), Jan Anderson (Marie), Rhodri Miles (Billy), Michael Sewell (Mike), John Samuel Worsey (Policeman)
Notes: The “mayfly”‘s method of incubating its larvae inside the human body have led some fans to draw the conclusion that the enormous insects are, or are related to, the Wirrn fought by the fourth Doctor in The Ark In Space, though there’s nothing in this episode to confirm that. Martha’s boyfriend is presumably Thomas Milligan, seen in Last Of The Time Lords. The Doctor apparently put in a good word for Martha after she left his company in that episode, leading to her UNIT recruitment.
LogBook entry by Earl Green