Don and his team must investigate the death of an independent computer researcher with a Defense Department contract, recruiting Charlie to decipher the victim's computer data.
When the hijackers of a truck carrying radioactive material threaten to detonate a dirty bomb in Los Angeles, Don and the team race against time to thwart the plot.
Don and his team call on a senior sniper instructor from Quantico (Lou Diamond Phillips) to help them stop a shooter who goes on a killing spree in Los Angeles.
Don fears he has sent the wrong person to jail when new information arises in an old case, so Charlie looks at the evidence but finds some flaws.
FBI agent Don Eppes recruits his younger brother, a brilliant mathematician, to help search for a serial rapist who has begun murdering his victims.
After their wedding, Charlie and Amita help the team look for Don's missing gun.
Don and the team investigate the deaths of two men who were sexually abused by a teacher as children an opportunity arises that may complicate Amita and Charlie's wedding plans.
The team gains notoriety while searching for jewels stolen during an awards show Don revisits an old case Larry returns from his adventure in the desert.
The team searches for a serial killer who targets men who solicit prostitutes Colby and Nikki deal with the aftermath of a car crash.
A lost shipment of high-caliber firearms links to murders across the city Amita and Charlie disagree on a wedding date.
Don and the team investigate the theft of scratch-off lottery tickets.
The team calls Agent Roger Bloom for help when money from the D.B. Cooper heist is recovered.
Don's team investigates when two members of a unit led by his former mentor are killed during a shootout with bank robbers.
A job protecting a high-profile political activist turns into a manhunt as the team searches for a sniper with his sights set on the controversial figure.
Amita's abduction leads the team to a charismatic sociopath (James Callis), but only Charlie can figure out what bizarre things the suspect has planned for her.
Disgraced FBI agent Roger Bloom (Henry Winkler) becomes a suspect when the team investigates a series of copycat bank robberies.
Still feeling responsible for putting Don's life in danger, Charlie focuses on tracking down a serial killer.
Don's life hangs in the balance after he is injured during a raid while investigating a series of home invasions.
The team thinks animal rights activists may have been involved in the death of a professor.
The team gets a last-minute tip that could exonerate a dangerous mob boss who is about to be executed Charlie tries to help the CalSci basketball team break their losing streak.