Transmat:Torchwood
Immortal Sins was the seventh episode of Torchwood: Miracle Day. For the most part, it consisted of a flashback in Depression era New York City. It importantly introduced the character of Angelo Colasanto, a lover that Jack Harkness met while standing in line at Ellis Island. Colasanto's grandaughter Olivia — played by Star Trek regular, Nana Visitor, also made her debut. Rex Matheson and Esther Drummond were resigned to cameo roles, while Gwen Cooper played an important part in the final acts of the episode. From a continuity standpoint, it was clearly the single episode of Miracle Day which made the most references to the broader DWU, even giving a shout-out to a Sarah Jane Adventures character.
Categorisation of our Torchwood material is done in two categories, because Torchwood is both the name of the series and the name of the central organisation within the series. If you're looking for information about the Torchwood Institute, go to Torchwood. If you want behind-the-scenes information, the top-level category is category:Torchwood (TV series).
Did you know that Torchwood is about more than just Captain Jack's little gang in Cardiff? That's just Torchwood Three. It's got multiple branches around Britain, and even an Indian subsidiary.
Just like its parent programme, Torchwood has spawned a range of novels and short stories. Writers known for their work with the classic version of Doctor Who have even written some of these prose stories, including former script editor Andrew Cartmel and prolific 1990s author Kate Orman.
People who work for the fictional Torchwood Institute are called Torchwood personnel. People who work on Torchwood are called Torchwood crew.
Torchwood has a unique record in DWU history: all of its series (or, if you like, seasons) have had strong continuing story lines. While there have been occasional standalone episodes, each series is narratively continuous, and leads to a payoff of some kind. Whether those payoffs are actually satisfying is, of course, nobody's business but your own.