Captain John returns to have his revenge. Taking Captain Jack prisoner, he sends him back in time for a long overdue reunion. Meanwhile, Cardiff is flooded with Weevils. Who is Captain John really working for?

A booby trapped building explodes and knocks the team unconscious. As their lives flash before their eyes, we learn how each of them was recruited to Torchwood – Captain Jack's initiation into a shocked Victorian Torchwood in 1899; Toshiko's daring mission to trade alien technology for her mother's life; how Ianto woo'd Jack with coffee and a flair for alien-catching and; the medical revelation that changed how Owen saw the world.

When a local teenager disappears Gwen is drawn into an investigation that reveals a darker side of Torchwood. Hundreds of people have disappeared without trace, but why is Jack obstructing attempts to find them? The answer seems to lie in the rift, and as Gwen follows the trail she makes a shocking discovery.

When an old cinema re-opens, past horrors emerge to stalk the streets of Cardiff. As bodies are found caught between life and death, Torchwood must act fast. Who are the Night Travellers and how can Torchwood capture these mysterious killers?

An alien shapeshifter leaves Gwen carrying more than she bargained for the night before her wedding.

Benched from the team and feeling increasingly victim to his newfound circumstances, Dr. Owen Harper struggles to find his place in the world. Will the lonely girl on the rooftop help him, or will it be a mission to retrieve an alien device that is proving more lethal by the second?

Deep in shock, the Torchwood team face their darkest hour. Attempting to put things right, Captain Jack unleashes a primal force that uses Torchwood as a conduit to wreak havoc across Earth.

Captain Jack calls in Martha Jones, now working for UNIT, to assist the team in investigating a string of mysterious deaths. However, when the trail leads to a medical testing centre, The Pharm, Martha puts her life on the line to go undercover in the increasingly sinister pharmaceutical facility.

When Adam, an alien with the power to change memories infiltrates the team, the entire dynamic of The Hub shifts. With Captain Jack caught up in memories of his lost family, Gwen struggling to remember Rhys, and Ianto convinced that he's a murderer... it costs the entire team dearly to rid themselves of Adam's influence.

When team investigates a mysterious alien meat supply that traces back to Rhys' haulage company, Gwen is forced to reveal the true nature of her work at Torchwood to a stunned and suspicious Rhys.

Toshiko falls for a handsome soldier, trapped out of his time, who unwittingly holds the key to saving the world. With an old hospital haunted by ghosts from 1918, a crisis foreseen by Torchwood 90 years ago is about to reach its climax. Time zones are colliding and with life and death decisions to be made, will Torchwood be able to stop an explosive end for Cardiff?

When a burglary turns into a slaughter and only one woman is left unharmed, Torchwood begin to suspect alien involvement. However, when the investigation escalates into a city-wide assault, Jack realises the whole planet is in danger.

The team are conflicted when Jack Harkness returns after his unexpected departure, but won't reveal where he's been. So, when an old acquaintance of Jack's arrives in the city and starts wreaking havoc in his quest to find something hidden on Earth, the team struggle to work out whose side Jack is really on.