Aside from being part of the same franchise, there are often crossover episodes where all of the casts interact.

For example, if an arson were to occur where someone is injured, the case would be looked after by Chicago P.D., the patients treated by the doctors of Chicago Med, and the fire would be put out by the firefighters of Chicago Fire.

There are also often multi-episode crossover events where different parts of the story are told in separate shows.

As new shows were added to the franchise, they were first given “backdoor pilots” in an existing series – a test run episode to gauge viewer reaction to see if it was worth commissioning a full series.

On top of this, every team frequents their local bar, Molly’s, at the end of each episode, tying them together even more.

The franchise is also tentatively linked to the Law and Order franchise, particularly Special Victims Unit, however crossovers are rare, with SVU being set in New York.

Based in the fictional Firehouse 51, Chicago Fire tracks the call-outs the firefighters, rescue teams and paramedics stationed there have to attend.

The show covers everything from the split-second calls they have to make and their fallouts, to their interpersonal connections - romantic and otherwise.

The series has run for 12 seasons, totaling 245 episodes. Season 13 has also been confirmed.

In terms of awards recognition, Chicago Fire has earned 25 nominations – including for Best Drama at the People’s Choice awards in 2024 – and six wins.

It currently stands at an 8.0/10 rating for IMDb, and an 88% audience score on RottenTomatoes.

Read more about Chicago Fire here.

Chicago P.D. follows two groups of police officers – uniformed patrol officers and the 21st District’s Intelligence Unit - as they hunt down criminals and major offenders.

The show covers everything from the split-second calls they have to make and their fallouts, to the interpersonal connections made to keep the team running.

Chicago P.D. also tackles corruption in the police department and how it is dealt with, with several key storylines involving abuse of power or “inside men” for the criminal underworld.

It has currently run for 11 seasons, with season 12 confirmed.

Chicago P.D. has earned 11 award nominations, and five wins, including the BMI Film and TV Award for best Network Television show two years in a row.

It currently stands at an 8.1/10 rating for IMDb, and a 90% audience score on RottenTomatoes.

Read more about Chicago P.D. here.

Chicago Med follows the fictional hospital of Gaffney Chicago Medical Center, and the experiences of the doctors in the emergency department.

The show tracks the lives and relationships of the doctors, nurses and surgeons while on shift, with a ‘case of the week’ format documenting the pressures they face as they figure out what’s wrong with each patient.

It has currently run for nine seasons, totaling 176 episodes. Season 10 has already been confirmed.

Chicago Med has averaged a minimum of nine million viewers per episode since it first launched, peaking in seasons four and five with an 11 million average.

It currently stands at an 7.6/10 rating for IMDb, and an 75% audience score on RottenTomatoes.

Read more about Chicago Med here.

Chicago Justice is the fourth and final series involved in the One Chicago franchise, and follows the Cook County State's Attorney team of prosecutors as they work on legal cases.

Like the others, the show had a ‘case of the week’ format as they try to lay down the law and deliver justice to the right people.

Unfortunately, unlike other shows in the franchise, Chicago Justice didn’t take off as expected.

As a result, it was cancelled after one season, with key characters being folded into others shows including Chicago P.D. and Law and Order: Special Victims Unit.

All three series in the One Chicago franchise have been given the official rating of 15 in the UK, as certified by the British Board of Film Classification (BBFC). In the US, they are marked as PG-13 or TV-14.

All three ratings warn that there may be scenes that may be inappropriate for younger or pre-teen audiences.

Reasons for this rating include:

• Implied sex scenes (though never explicitly shown)
• Minimal to no nudity
• Mild violence
• Frequent depictions of peril and dangerous situations.
• Depictions of severe injuries including burns, blood and in some cases death.
• Moderate displays of bloodshed, most typically in a medical situation while someone administers aid.
• Some storylines viewers may find distressing, with themes including suicide, sexual assault, domestic abuse and self-harm depending on the episode.
• Chicago P.D. also shows guns within the context of them being used by the police, or by criminals.

Sky is the official UK home of the entire One Chicago franchise.

All three of the separate series are available to watch on Sky Witness and NOW today.