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Viva Las Vegas

Greg's first day in the field has him accompanying Grissom to the scene of a fatal nightclub shooting. Catherine tackles the death of a stripper found in a hotel suite. Warrick must determine if foul play is responsible for the death of a man found electrocuted in his bathtub. Nick and Sara get the more unusual case: an 'alien' body is found buried near Area 51.

Down The Drain

A man's badly twisted corpse is found in a city storm-drain tunnel following a severe thunderstorm, and the discovery leads to another disturbing finding: human bones that may have come from a murder victim. As more bones are found the investigation focuses on identifying the victim and pinpointing the location where the body was dumped.


Grissom and his crew investigate the kidnapping of a 12-year-old girl taken from a convenience-store parking lot while her older sister is inside. The case hits the CSIs hard and Catherine even harder after Lindsey is picked up by police for hitchhiking. Back in the lab, Greg's latest replacement attracts Warrick's attention but her eccentric personality could be a problem.

Crows Feet

A woman is found dead in a hotel room, her body covered in skin lesions. At first an infectious disease is suspected, but soon the CSI find themselves with a second victim, both of whom received bizarre anti-aging treatments at an expensive spa. Grissom, Sara and Greg probe the death of a man found dead in his house while it was being fumigated.


Swap Meet

Grissom investigates the death of a woman found dead in a neighborhood fountain following a sex party. Across town, Nick and Warrick probe the murder of a man killed with a table saw in a closed video arcade.

What's Eating Gilbert Grissom?

The 'blue paint' killer returns. Grissom believes that a serial killer responsible for several deaths at a Las Vegas college over the past 17 years is at it again when body parts are found on campus. But the latest victim is a departure from the killer's previous targets.



The CSIs investigate the death of a high school student at a private party in the hotel suite upstairs from the school's homecoming dance.


The 100th episode explores the world of transgenders in what turns out to be the ultimate case of mistaken identity.

Mea Culpa

After Grissom discovers a previously undetected forensic clue on a piece of evidence during a murder trial, new assistant lab director Conrad Ecklie (Marc Vann) seizes the opportunity to put Grissom and his late shift team under the microscope.


No Humans Involved

Tension rises as the CSI teams adjust to their new assignments while investigating two vastly different murders. Grissom and his team hunt for a killer after discovering the remains of a young boy starved to death and left in a plastic container. Meanwhile, Catherine assumes her new role as supervisor and quickly finds herself at odds with Warrick when he takes an overly aggressive approach in an investigation involving possible police brutality


Who Shot Sherlock Holmes?

The CSIs investigate the murder of a Sherlock Holmes enthusiast in his perfectly re-created Victorian Era Baker Street study. While the initial evidence leads the team to believe this was a suicide, Grissom discovers a clue that indicates the death was indeed murder. Meanwhile, Nick and Warrick investigate the death of a car accident victim who went over an embankment in the desert



When a dead baby rattlesnake is found in the throat of a decapitated female head, the CSIs are thrust into the dangerous world of narcocorrido, a Mexican music/lifestyle underworld that glamorizes violence and brutality. Meanwhile, a body is found in the front seat of a handicapped van in a casino parking structure where Sofia and Greg find evidence that the shooter may have been confined to a wheelchair