
When former stars of the popular 1960's television show ""Captain Crimestopper"" are murdered, August suspects the show's star, out-of-work actor Wayne Berry, but Chase refuses to believe that one of his childhood heroes could be a murderer. At one of the crime scenes, the detectives apprehend a man disguised as the superhero, who turns out to be Berry himself, intent on finding the killer. When forensics concludes that Berry is not the killer, the actor is released, but an attempt on Berry's life at an autograph-signing puts the detectives on the trail of the one responsible.
Detectives August Brooks and Chase McDonald meet when August and several officers are being overwhelmed by criminals in an explosive shootout. Chase arrives in his Porche and immediately neautralizes the situation with a grenade launcher. Moments later, August discovers that Chase is his new partner, and they are immediately assigned the case to track down a bomber - nicknamed the Daybomber - who has set off a series of explosions in his quest to warn people of the advances of technology.
Chase and August are at August's gym, where they are volunteering their time to help keep kids off the street and out of gangs. In the boxing ring is Andre, a young fighter determined to stay away from gang violence. But when word comes in that Andre's brother has been shot and killed by a rival gang, Andre swears to avenge his brother's death. Chase and August try to persuade him to let the police handle it, but Andre slips from their grasp in pursuit of the killer. The incident also brings back memories for Chase, who is struggling with unresolved guilt over his former partner's murder by a gang youth.