S02E12: 'Fragments'

The Torchwood team, minus Gwen, investigate a derelict building and are caught up in a trap as it explodes. The quartet experience flashbacks about their origins with the alien-fighting organisation.

Captain Jack is picked up by the all-female Torchwood in Victorian times once they become aware of his immortality. They torture him in order to extract information about The Doctor, to no avail, but soon decide to enlist him as an agent. After many decades pass, Jack discovers that one of his colleagues has murdered everyone else in the Hub through fear of the new Millennium and the horrors it may hold.

Toshiko joins Torchwood after Jack finds her in a top secret prison because she leaked information from her Military Of Defence job to a vicious gang holding her mother captive. Jack is impressed by her ability to assemble a Sonic Modulator despite flawed instructions and ensures she is released and given a pardon once she accepts the Torchwood job.

Ianto harasses Jack for a job following the demise of Torchwood One, where he initially worked. Helping Jack fight off a Weevil and repeatedly praising his coat doesn't work at first, but the pair successfully capture a pterodactyl together - with the help of some chocolate - and Ianto is enlisted.

Owen encounters Jack when he bursts into a hospital room during brain surgery on Owen's ailing fiancée Katie. He removes an alien from her brain and knocks out all the witnesses, including Owen. Katie immediately dies and Owen wakes up to discover a massive cover up. He encounters Jack when visiting his wife's grave and, after a fight, agrees to join Torchwood as a medic.

Back in the present, Gwen and Rhys help to pull everyone from the debris in the building. However, Jack receives a hologram message from Captain John in which he claims responsibility for the bombs and claims to have his brother Gray captive.