Main •
James Woods as Deputy DA Sebastian Stark, the protagonist of the series and head of the mayor's special unit. At the beginning he is not satisfied with his new job and does not get along well with his team; but he gets used to the new circumstances relatively quickly and is also almost unbeatable as a public prosecutor. •
Jeri Ryan as Jessica Devlin, the district attorney, and Stark's supervisor, in the show's first season. Initially, she is opposed to Stark as a prosecutor; over time she comes to terms with him and works reasonably well with him. She does not always agree with Stark's methods. In the second season, after her failed reelection, she is a deputy DA and member of Stark's team. •
Danielle Panabaker as Julie Stark, Sebastian Stark's daughter. Because her parents divorced, she moved in with her after her custody hearing, because "he needs her more than he'll ever know." Her mother went to New York City with her new partner. •
Sarah Carter as Deputy DA Madeleine Poe, a prosecutor who in the first episode joins Stark's special unit voluntarily to learn from him. She had the highest conviction rate of the entire DA's office in the last two years prior to the show's start, and is arguably the best lawyer of Stark's original team. •
Sophina Brown as Deputy DA Raina Troy, a prosecutor. Troy is passionate, smart and tough and described by Stark as "brilliant" but "a contempt citation waiting to happen." Midway through the first season she begins a relationship with Stark's investigator Isaac Wright. •
Samuel Page as Deputy DA Richard Casey Woodland (season 1) is a prosecutor thanks to his father, a senator, gaving him the post. Only Jessica Devlin knows about it and blackmails him in the third episode so he has to provide her with information about Stark's contacts. A young, handsome lawyer from an influential family, Casey finds himself having to prove his worth to those who think he bought his way into the job. He begins a sexual relationship with Madeline Poe despite their disdain for each other. He leaves the team at the end of the first season to devote himself to his father's election campaign. •
Alexis Cruz as Deputy DA Martin Allende (season 1) is a prosecutor. In the eleventh episode, he rescues a girl in a shootout but gets shot and dies. •
Henry Simmons as DA Investigator Isaac Wright (guest in the second episode; main, from the eighth episode of season 1) is a former police officer who was dismissed for false testimony. He takes Stark's offer to work for him as an investigator, after much hesitation. Over time he establishes a relationship with Raina. •
Kevin Alejandro as Deputy DA Danny Reyes (season 2) is a prosecutor. He joins the team in the first episode of the second season. Previously, he worked in the Department of Organized Crime in L.A., primarily with Eastern European gangs. He had the highest conviction rate among his peers in his six-year career. At first he dislikes Stark, but quickly learns to appreciate him.
Recurring •
Carlos Gómez as Manuel "Manny" Delgado is the acting mayor. In the first episode, he persuades Stark to change to the prosecutor. Nevertheless, he sometimes opposes him to enforce his own interests. •
Billy Campbell as Wayne Robert Callison, a ruthless serial killer, creative writing teacher and Stark's personal nemesis throughout season 1. He targeted emotionally damaged women in their 20s and tortured them to death by cutting them. After he is acquitted, Stark becomes obsessed with putting him behind bars. •
Shaun Sipos as Trevor Boyd (season 2), Julie's boyfriend •
Kevin Pollak as Leo Cutler (season 2), the new district attorney and thus Stark's superior. He won the elections against Jessica Devlin and has since held her post. Stark and he dislike each other from the beginning—Stark considers him an "incompetent ass crawler" in his own words. •
Paula Marshall as Jordan Westlake (season 2), a young and driven state prosecutor who helps Stark when Jessica has to leave town to help her ill father. ==Broadcast history==