While Langston testifies in the trial of a respected Congressman, new evidence sends the CSIs back to the lab to reopen the investigation.

A band of vicious bikers is given the go-ahead to take down one of their own when it's discovered that the guy is an undercover cop.

Two secretaries on holiday from Arizona attempt to steal a man's wallet and ATM pin number in a scam, and wind up dead in different locations. Meanwhile, the CSI team also investigates a disturbing medical mystery involving the dumping of human organs in a wildlife refuge.

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.

The CSI team investigate the murder of a man whose daughter was killed five years ago, and the bizarre death of a young man who appears to have been killed by a T-Rex.

While investigating the murder of a convicted ex-cop, the CSIs stumble upon a list in his prison cell with names of several individuals he believed might have been his wife's true killer.

Catherine's friend Laura's mogul husband Mark has a lot to hide behind his successful international corporation, and he's hired a crack team of assassins to carry out the murders of anyone who might be aware of what he's doing, and that includes Laura's lawyer and Laura herself.

When a photo of a dead college student starts trending on the Internet, the team steps in to investigate.

The CSIs arrive at their favorite diner only to discover a gruesome crime scene with eight dead victims and a lot of questions

The CSI team investigates the death of a reverend who was killed at the grave site of former CSI Warrick Brown.

When CSI Mac Taylor decides to surprise his girlfriend in Vegas, he discovers she’s missing and asks his friend D.B. Russell for help.

The crossover concludes on CSI: New York S09E15 Seth and Apep (2).

When the CSIs find a body near a forest reserve, they discover what might be a serial killer and his bizarre lair.

The CSI team investigate a murder at a high stakes poker game.

The CSI team is called in to investigate the stabbing of a couple found at a local motel that is reminiscent of two incidents that occurred in the same room.

When a woman is found dead in Mexico and a murdered couple is discovered in a driveway, evidence from one investigation could help the other.

When a teen opens fire in a police station, Russell is taken hostage.

Sara and Greg are quarantined after responding to a crime scene that’s contaminated with a deadly pathogen.

The CSI team find themselves taking a look into the kinky world of “rubber dolls” as they investigate the murder of a man stabbed in an alley.

Grissom and Willows return to help the CSI team solve a catastrophic case that paralyzes all of Las Vegas.