City (franchise)

The City  series is a shared universe consisting of shows, comics and stories based on the Half-Life video game series by Valve, specifically Half-Life 2. It began with City 17 in August 2006, which was then followed by a spin-off City 14 in 2007. The spin-offs are designed to expand the universe and depict the events in other Combine run cities, either before, prior or after the events in Half-Life 2.

City 17
City 17 launched in August 2006 as a semi spin-off to the short-lived Half-Life Television Series. Originally beginning as a prequel taking place years prior to Half-Life 2, it depicted the lives of numerous citizens in City 17 under the control of the Combine. In 2007 the series loosely adapted the events of Half-Life 2, although veered into alternative continuity to avoid the destruction of City 17 as depicted in Half-Life 2: Episode One. Following that the series served as an unofficial continuation to Half-Life 2, although it began to have less to do with the Half-Life lore as time went on.

City 14
City 14 was a spin-off to City 17, which launched in February 2007 - six months following City 17's debut. It followed the adventures of Nathan Johnson and Samantha Robertson. It ran for a ten episode run, before being ended in order to bring City 17 back for a full run. City 14 returned for a tenth anniversary mini-episode in February 2017, before returning for a full second series in the spring of 2018. A third series aired in the spring of 2020. A fourth series debuted in December 2021, centering around a new cast although including abolished storylines from City 17.

City 18
City 18 is a lost short-lived two part spin-off to City 17, which launched in 2008. City 18 would later be featured in City 17 itself, and would make numerous appearance as a neighbouring city.

Abolished shows
These projects received a pilot or backdoor pilot (an episode within one of the main shows with the intent to be spun-off into another series) but never reached beyond that initial idea.

City 17 Hospital
City 17 Hospital was first proposed back in 2006 during the first series of City 17 Street, and would depict the goings on at the hospital seen in Half-Life 2: Episode One prior to the Uprising. A couple of episodes centered around the hospial were aired in early 2018 during Nathan's illness storyline, but the location wasn't used beyond that.

City 12
City 12 was written as a proposed episode by Hannah Robertson as a side series to City 14. The project was abandoned, but the location was used in 2012.

Mesa City
Mesa City was to be set in an alternative continuity following the events of the original Half-Life, in which the Seven Hour War never took place. A pilot episode titled "New World" released for the festive period in December 2014, which saw Nathan Johnson teleported to an alternative Universe. The story got made using The Sims 4 and although there were plans for a full series for a 2015 release, the project was abandoned due to lack of interest.

City 30
A thriller series titled City 30 was planned to be made in 2020, which would take place in a fictionilized Detroit years following the Combine occupation, and centering around a police detective named Kelvin trying to solve grisly murders carried out by a serial killer. The detective was later introduced in the fourth series of City 14.

City 42
City 42 was proposed in 2013 and would have been a crime drama taking place in a fictional Combine occupied Los Angeles. The project was abandoned.

Happyville
Happyville was a proposed prequel to City 17, which would have taken place after the Black Mesa Incident but before the Seven Hour War. A story treatment was written but the idea was scrapped.