Police Constable Gwen Cooper comes across the mysterious organization known as Torchwood. While investigating their world, she finds technology and methods she never imagined.

Torchwood must stop a sex addicted alien as it leaves a trail of gruesome deaths in its wake.

There's a dark secret in the basement of the Hub. Even Jack is unaware of it, but Ianto knows. And he'll go to any lengths, sacrifice anything and anyone, to protect what's down there.

Jasmine is a withdrawn but intelligent child whose new 'friends' exploit her suppressed anger, and while investigating this, Jack encounters elemental enemies from his past that are determined to harm those closest to him.

The team is asked to analyze a recently discovered 18th century corpse with a hole in its chest. Meanwhile, a mysterious charismatic woman seduces Tosh and gives her an alien pendant that allows its wearer to read other people's minds.

The invisible spirit of a hit-and-run victim tries to convince Gwen to locate the 'alien' who might have been responsible for his death.

When a passenger plane from 1953 arrives in Cardiff in 2007 due to the Rift, the Torchwood team try to help three temporal immigrants adapt a new life in the city.

The team discovers a ring who are kidnapping Weevils - wild alien creatures that have come through the Rift and are hiding on Earth - which leads Owen down a dark path to confront the future of his own existence.