The CSI's lives are on the line as they close in on the elusive Dr. Jekyll, and more than one member of the team may not live to see his capture.

The CSI team must investigate one of their own when Langston is accused by a former colleague of being part of the Dr. Jekyll murders.

Mother thought to be grieving for the loss of her family three years ago becomes a suspect in a CSI investigation.

Legendary comic from the good old days of Las Vegas is set to reunite with his partner on stage for one night only, until one half of the famous duo is found dead.

When a student is discovered murdered at Lindsey's school, the investigation takes a sharp turn when the CSIs uncover an unlikely connection between the boy's death and atrocities of the past.

When Hodges and Wendy take a group of high school CSI Explorer Scouts on a field trip, they embellish their role in solving cases and take their assignment a little bit too far.

When the CSI team investigates the brutal murder of a family, they trace the killer to the house next door, which might belong to the "Dr. Jekyll" serial killer.

Catherine and Detective Vartann are thrown together in a hotel room for 24 hours as they stake out a duo making drugs in the room next door. Meanwhile, Nick and Langston work a case that involves a fetish which has become big business in Vegas.

When a young boy is found murdered, the CSI team uncovers evidence that may link his death to an old case that recently resurfaced.

When a band member of Rascal Flatts is electrocuted by his own guitar during a concert, the CSI team investigates if it was a case of foul play.

The case of two high school students, one dead and one missing, lead the CSIs into the underbelly of streetcar racing and a tangled web of deadly competition.

The CSI team delves into the world of professional golf when the body of a legendary player is discovered during a high-profile tournament.

Two beautiful women are murdered in a Las Vegas hotel and the CSIs uncover an unusual killer during their investigation. Meanwhile, Langston continues to hunt "Dr. Jekyll".

The CSIs dig to find the truth about how a recent shootout at a gun store might connect to a young woman who may have committed suicide.

When Nick, Greg and Hodges take Henry to celebrate his birthday at a biker bar, they uncover a double homicide and find several suspects still at the bar who may be the murderers.

The CSIs investigate a murder at a bowling alley after a critical piece of evidence is revealed during a bowling tournament.

The CSI team helps Langston investigate a prostitution ring that may have harbored a hostage Langston had been looking for in Miami and New York.

The CSIs discover that two apparently unrelated crimes are actually parts of the same twisted revenge plot.

An entire college football team comes under investigation when their beloved coach is found murdered in his home.

When a policeman kills another officer, the CSIs must look to the evidence to determine if the shooting was premeditated or an accident.

When two office mates plot to rob a casino, their plan ends with the CSIs investigating a murder.

When a porn producer and drug dealer are found dead in a relatively upscale Vegas area, the CSIs focus their investigation on members of the neighborhood.

The CSI team, with the unexpected but welcome return of Sara, comes together to investigate the death of a famous young actress killed in a dubious traffic collision.