Captain Jack Harkness is a man from the 51st century trapped in the past who leads the last remnants of the Torchwood Institute, a top secret British agency outside the government whose job it is to investigate alien goings on in the world, act in mankind's best interest, and, if needed, be the Earth's last line of defense.
Captain Jack returns, as the Torchwood team reunite to fight a rogue Time Agent. The mysterious Captain John Hart is determined to wreak havoc, and needs to find something hidden on Earth. But with Gwen's life in danger, and cluster bombs scattered across the city, whose side is Jack on?
When a burglary turns into a slaughter, Torchwood suspect alien involvement. Who is Beth, and can she be as innocent as she seems? But when the investigation escalates into a city-wide assault, Jack realises that the whole planet is in danger.
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 Rhys discovers the truth about Torchwood, he helps the gang to find the source of an unusual alien meat supply.
A memory thief gets in to the minds of the Torchwood team, and uncovers long forgotten secrets.
Jack calls in an old friend for a favour, none other than Martha Jones, as they attempt to stop a pharmaceutical facility that uses aliens in the hope of discovering a cure for all diseases.
Captain Jack resurrects Owen with a resurrection glove, only to find out that the new glove isn't quite what they'd bargained for. Owen, in an undead state, helps the team figure out why he's still around.
A victim of his newfound circumstances, Owen Harper believes he needs absolution. Will the lonely girl on the rooftop help him, or will it be a mission to the retrieve an alien device that is proving more lethal by the second? And how far will Toshiko go to help him?
Gwen awakes on her wedding day to find she has been impregnated by a shape-shifting alien male. With it's life-partner eager to retrieve it's mate at the cost of Gwen's life, the team race to intercept her as Gwen decides to go through with her marriage at a secluded location with all of her family present
An old cinema reopens and mysterious horrors of the past return to Cardiff. Why are people trapped between life and death, questions are asked about the Night Travellers, and what Torchwood can do to stop them.
Gwen finds the darker side of Torchwood when a teenager disappears, investigating why hundreds of people have vanished without a trace. Jack is obstructing attempts to find them, and the answer appears to lie in the Rift.
As the team are knocked unconscious we find out how Jack, Toshiko, Ianto and Owen were initiated into Torchwood.