Sara's fate remains in question as the CSI team rushes to find out if she survived an attack by the miniature killer.
The CSI team investigates two unusual cases, one involving the suspicious death of a go-cart racer, who took his hobby to the highway and paid the price with his life, and a murder at a hip new restaurant where patrons dine in the dark. Meanwhile, Sara and Grissom are questioned about their relationship.
The CSI team investigates the murder of an entire family, except for one daughter who supposedly is possessed by the devil.
A young man, whose body looks like that of a woman, is found strangled to death by hanging.
Grissom and his team go behind the scenes at a horror adult film studio when one of the lead actresses is murdered on the set of her latest movie.
In this crossover episode with "Without a Trace," a kidnap victim from New York who went missing six years ago may be the same boy whose death Grissom and the CSI team are investigating in Las Vegas.
A suspect from Sara's past returns, causing her to question her future as a CSI. She ends up quitting for good.
Hodges has ulterior motives when he stages hypothetical murders in the lab to give his colleagues a chance to play CSI. Also, everyone tries to reach out to Grissom after Sara's departure.
Warrick's addiction to pills begins to impact his job when his investigation into the underground mob in Vegas results in him being targeted as the prime suspect in a mob-related murder case.
Grissom and his team delve into the world of illegal dog fighting to find out who is responsible for the death of a wealthy socialite. Meanwhile, Warrick tries to clear his name in the murder of an exotic dancer.
The CSIs investigate two murders during the annual bull riding rodeo in Vegas that may be connected to illegal bull breeding.
Grissom and his team battle the flu when they are called upon by DDA Klein to investigate the deaths of several key witnesses for a grand jury case against a dangerous Las Vegas gang.
The disturbing death of a 3-year-old girl has a great impact on Catherine as she searches for clues to her murder.
Brass and Nick get help from an unlikely source, an incarcerated criminal, when investigating two murders that take place in the same apartment building.
Grissom and his team discover several victims who have green blood, leading them to the conclusion that their deaths are somehow connected.
Grissom and the CSI team become involved in the world of Hollywood comedy when a diva sitcom star meets an untimely demise while filming her show in Las Vegas.
When Gedda turns up dead and Warrick is found at the murder site, he is arrested. The CSIs find evidence that he was framed and clear him. However, he is shot on his way home from their celebratory dinner.