The series is set in Cardiff, some time after the Doctor Who (2005) series two finale, setting it in 2007 and later in early 2008 ahead of its actual air date. It follows the Wales branch of a covert agency called the Torchwood Institute which investigate extraterrestrial incidents on Earth and scavenges alien technology for its own use. To paraphrase Torchwood Three's commander-in-chief, Captain Jack Harkness, the organisation is beyond the government, the police, and the United Nations. Their public perception is as merely a 'special ops' group.
List of shows that I have seen that are rated TV-MA.
Note: Some shows I couldn't find the rating but I assumed that they were TV-MA or the equivalent based on their content.
List of TV series that were cancelled and shouldn't have. Either because they were good to the end. Or because it was good but at some point someone messed up so badly it had to be euthanised for its own good.