Urban Chaos: Riot Response is a first-person shooter videogame developed by Rocksteady Studios and published by Eidos Interactive for the PlayStation 2 and Xbox. The game was released in spring 2006.

In the game, you play as Nick Mason, a member of the newly-formed "T-Zero" riot response squad, in an unnamed modern American city that's been overtaken by the notorious Burners gang. The gang members are attacking civilians, paramedics, firefighters and police officers, and it is up to you to stop them. You must defeat them by whatever means necessary in order to win your city back, capturing gang leaders and rescuing injured civilians along the way.

The game was known by three different names in development.

Characters

Officer Nick Mason Main character of the story, and controlled by the player. Newest recruit of T-Zero (Zero Tolerance) riot response unit of the police department. Thanks to him he managed to hamper the Burners' activities and keep civilian casualties to a minimum. He quickly became known city-wide as "The only hope of the city". He was nicknamed the "Angel of Hope Street" after his first mission where he saved the Hope Street Police Station from being overrun by Burners.

Sgt. Adam Wolf Commander of the T-Zero unit, Wolf is a veteran who served in the United States Marine Corps for 12 years before joining the Police Department. He is under constant pressure by the media and civil activists just like the mayor.

Chief Trudy A policewoman who sends all information to Mason during missions. Except for her voice nothing is known about her.

Mayor John Wyatt Current mayor of the city. He is being severely criticised for his inefficiency in stopping crime in the city. Although he did his best in creating "T-Zero," the only thing that can save the city, he was nevertheless criticised again for spending enormous funds (several million dollars) to the creation of the unit.

Lani York Anchorwoman of the Channel 7 News. You will see her before every mission.

Sally Taylor Reporter working for Channel 7 News.

Karl Estavez A prisoner who tried to escape the police station he was held in. An attack was made on the place to free him, but Karl died when Nick Mason shot him into gas tanks during a hostage situation, blowing him up.

Crocker Leader of the Burners. He is first seen in the final level, leading an assault on Nick's home. He is killed during a hostage situation in a meat factory, where Nick shoots him over a rail into a meat grinder.

Various other sub characters that help Mason throughout the game are named, being a part of emergency units IE Medics or Firefighters.

• Paramedic Jane Delaney
• Paramedic Tera Hart
• Fireman Mike Forrester
• Fireman Doug Johnson
• Police Officer Curtis Daniels
• Police Officer Hal Forrester