Created by Russell T Davis, Torchwood follows the adventures of a team of investigators using alien technology to solve crime: some terrestrial, some not.

Led by the enigmatic Captain Jack Harkness (John Barrowman), the Torchwood team includes Gwen (Eve Myles) the group's conscience, charming medic Owen Harper (Burn Gorman), reserved Toshiko Sata (Naolo Mori); the super intelligent and intense Suzie Costello (Indira Varma); and Ianto Jones (Gareth David Lloyd) who is far more important than his receptionist's role suggests.

In this episode, an alien addicted to sex is let loose on Cardiff's nightlife, leaving a trail of gruesome deaths in its wake. Captain Jack and Torchwood must track down the creature's new host and in doing so confront a violent new form of love in the 21st century.