Main •
Justin Hires as Detective James Steven Carter, •
Aimee Garcia as Sergeant Didi Diaz, Carter's former partner. After her son Derrick was born, she decided to work from her desk instead of on the streets. To avoid her from being humiliated from the other cops, Carter took the heat and let them believe that he dumped her as a partner. •
Page Kennedy as Gerald Page, a low life criminal and Carter's cousin who is secretly his and Lee's informant to help them solve cases. When he was 16, he and Carter robbed a man outside a liquor store with an unloaded BB gun. When the cops arrived, he told Carter to run, believing that his cousin had more potential in life than he ever would. •
Wendie Malick as Captain Lindsay Cole, a detective who works with Carter and Lee. He and Carter have a strong dislike for each other. •
Steele Gagnon as Derrick, Didi's young son. •
Julianna Guill as Dr. Alice Rosenberger, the
medical examiner for the
LAPD. She has a huge crush on Lee. •
Diedrich Bader as CIA Agent Westhusing, part of a task force combatting the Quantou. • Lyman Chen as MSS agent Joseph Yun, Kim's superior. He is outed as corrupt and working for the Quantou after selling Kim out to them in the final episode, and arrested by Carter and Lee. •
James Hong as the Dragon of the Quantou, and the series' main antagonist. He is willing to do anything to take and retain power over Los Angeles, even killing his own son, Zhou Tu. He is killed in the finale by Carter, Lee, and Kim after admitting to having Lee and Kim's parents killed in a hit disguised as a car accident. •
Byron Mann as Fong, the Dragon's loyal right-hand man.
Notable guest stars •
Robyn Lively as FBI Agent Myers •
Lewis Tan as Cheng •
Doug Savant as D.A. Ginardi •
Vernee Watson as "Grandma", Carter's and Gerald's foster mother. •
Janel Parrish as Nina ==Episodes==