WPC Gwen Cooper is at the scene of a brutal murder, when the "special ops," known only as Torchwood, arrive. After witnessing the group bring the dead man back to life, Gwen goes in pursuit of this mysterious organisation, only to see weirder things than she could ever imagine existed. Soon after, she begins to regret giving in to her curiosity, when she meets Captain Jack Harkness.

Rozpoczyna się pierwszy dzień pracy Gwen w Instytucie Torchwood. Wraz z kapitanem Jackiem Harknessem oraz pozostałymi członkami grupy musi ona namierzyć i schwytać tajemniczą, obcą formę życia. Objawia się ona jako fioletowa mgła. Wkrótce okazuje się, że obca istota żywi się ofiarami w trakcie kontaktów seksualnych.

Whilst chasing a man, Gwen retrieves an unusual machine that allows the user to see back into the past. It is considered dangerous, and no members of Torchwood are permitted to use it. But Owen has other plans, and witnesses a violent murder that took place over forty years ago. Using the information he gathered, Owen starts to track down the still-living murderer.

A Ianto themed episode

Ianto Jones hides a very big secret at Torchwood - his half-converted girlfriend from the Canary Wharf Battle - down in the basement. He is quick to hire a Japanese doctor who believes he can "cure" her. But things soon go wrong, and the Cyberwoman's destructive powers are released to the whole of Torchwood. Upgrading is compulsary.

Przedmieścia Cardiff zdają się być pod wpływem sił nadnaturalnych. Co ma z nimi wspólnego pozornie spokojna rodzina Pierce'ów?

Whilst investigating a group of unexplainable deaths in a village, the Torchwood team are separated. Discovering further, Jack, Gwen and Owen find a scared man, hiding from the thing responsible for the murders. But Tosh and Ianto go that one step extra, and locate the killer, who wants them as their next victims.

A Toshiko themed episode

Tosh meets an unusual woman, Mary, at a bar, who gives her a strange pendant. She is upset, yet amazed by what she now has - the ability to read people's minds. However, Tosh finds this terrible curse, that contains her friends darkest secrets, must be broken. So she asks for help from Mary, the only person who knows, but first, Tosh has to get her into Torchwood.

Jack i jego ekipa prowadzą śledztwo w związku z serią zabójstw popełnionych w mieście. W trakcie badania sprawy wychodzi na jaw, że ktoś chce za wszelką cenę zwrócić na siebie uwagę. Czy jest coś, co łączy tajemniczego Pielgrzyma z przeszłością oddziału?

W noc poprzedzającą ślub Gwen musi poradzić sobie z pracą i wieczorem panieńskim. Tymczasem Obcy daje jej coś, czego nie chciała.

Three passengers from 1953 arrive in modern day Cardiff, when their plane flies through the Rift. With no means of travelling back, each person must adapt to their new life, starting personal relationships with the separate members of Torchwood.

A Jack themed episode

Whilst investigating an old, derelict dance hall, Jack and Tosh are transported back to the 1940s, during the Blitz. Owen, Ianto, and Gwen realise, in modern day, that this has happened, and go in search of clues Tosh may have left. Meanwhile, back in the forties, Jack meets a very interesting man. One with the name Captain Jack Harkness...

With the Rift having been opened, people and objects throughout time are falling through it, and being spread across the world. "The thing in the darkness" has finally come, and Jack realises that he is the only one who can save planet Earth from the destruction that "the son of the Beast" will cause.