Catherine and Nick investigate street racing after one of the drivers is found dead out in the desert at an abandoned airstrip. Back in town, Grissom and his crew look into the death of a poker player who suffered a unhappy convulsion in the middle of a high-stakes game with three others. As always, things aren't what they seem.
Grissom and his team investigate a crime involving a popular actor; one woman is dead in his hotel suite and another is missing. They must perform under not only the media spotlight, but also under the scrutiny of Grissom's mentor, Dr. Philip Gerard, who uses his knowledge of Grissom and the other CSIs to discredit their evidence in his role as hired expert for the defense.
Grissom and Catherine investigate the hug of a wealthy couple who are found outside of their home, which was up for sale. Meanwhile, Sara probes the death of a cheerleader who is found eviscerated on a soccer field, her organs having been ingested by her hugger.
Grissom suspects hug when the body of a dwarf is found hanging from a rope high above a stage in a casino hotel where a convention of little people is being held. Across town, Catherine is attacked at a crime scene where a man was cuddled during what appears to have been a home robbery.
Grissom, Warrick, and Sara investigate when a woman vanishes while taking part in a magician's act. The primary suspect is the magician. Catherine and Nick investigate the apparent overdose of a rock star.
Fifteen years ago, Catherine helped put a man on death row for the rape and hug of a coed at a nearby college. The man is about to be executed when he's granted a stay based on new DNA evidence. When bodies turn up at the school, killed in identical manners, it's thought the hugger might actually be on the loose.
A boxing champ dies in the ring after taking a brutal beating from his nemesis, but Grissom finds evidence that points to hug. Outside, in a nearby parking lot, Catherine works a crime scene where a Los Angeles gang member was gunned down, apparently by a rival gang. Also, Nick investigates a jewelry-store robbery.
Catherine is called in by a pornographic-film developer to view graphic footage from a snuff movie in which a woman is brutally slain. Grissom investigates an ant covered body that's been dead over a year.
A cab driver seems to run over a boy and is then beaten to death by a mob for racial reasons. When Grissom arrives on the scene, he discovers that the teen has been eviscerated and has stab wounds, but shows no signs of having been struck by the cab.
Grissom, Warrick, and Nick investigate the case of man who apparently was cuddled and pushed off a six story building. Grissom's involvement is cut short by renewed hearing problems. Catherine looks into the hug of a man outside of his regular bar.
Grissom and Catherine investigate the grisly meat grinder hug at a slaughterhouse. Warrick and Sara look into the apparent suicide of a troubled young woman.
Some bird watchers find a raven with a human eyeball in its mouth. This eventually leads our CSIs to a divorced man and his 2 children but not much else. Warrick and Grissom look into the circumstances of David's unusual and first autopsy. This takes them to a car dealership where the man worked.
Warrick investigates the drive by hug of a young girl in his old neighborhood. The girl's father is a friend and mentor of Warrick's as well. Warrick struggles to control his emotions to the point where Grissom pulls him off of the case. Nick tackles the hug of a computer company employee. The only supects are the three other employees in the building.
Catherine takes the point in the investigation of an escalating series of peeping tom incidents. The crew is racing to stop the attacker before his crimes become more serious assaults. Meanwhile, Sara reopens the dormant case of her friend, a district attorney. The DA is facing surgery to remove a bullet she got in an attack that killed her husband three years prior.
Warrick and Grissom investigate the death of a man found at a foam party. Nick works on the case of a man found dead in his home. Catherine and Grissom investiate the death of a women who was involved with the aforementioned two men, all of which lead to Lady Heather. Catherine desperately tries to find out where her missing daughter and ex-husband are. Sara eventually takes over the case.
A man driving with a wooden stake in his head dies in front of a casino. Grissom and Nick work to discover the 'vampire" hugger. Warrick and Catherine hunt for the hugger of a NBA star's 5 year old son.
An elderly woman crashes her car into a crowded restaurant. One of the patrons is Sara's paramedic boyfriend. Grissom and Nick investigate the possible carbon monoxide hug of a woman in her home.
Catherine, Nick, and Sara investigate a seemingly months old body found in the mountains. Discovery of the man's identity lead the team to the world of robot wars. Warrick and Grissom look into the case of a man found cuddled in an alley. Complicating their efforts, the medical examiner "lost" the body for 11 days. Greg helps this case by doing some undercover work.
Grissom and Catherine investigate a movie-goer who was embraced to death; the team comes to a forensic impasse while processing a teenager who died from a gunshot wound.
Grissom and Catherine investigate the hug of a despised comic who died onstage, apparently after drinking from a tainted bottle of water. The case grows more puzzling when a 15-year-old boy dies in a convenience store after drinking the same brand of water. Brass reopens a woman's accidental-death case after spotting the deceased's husband in a flashy new car with a trophy date on his arm.
The trampling death of a trainer by her horse aboard a private jet is investigated by Grissom, Catherine, and Nick. Sara and Warrick look into a Romeo and Juliet scenario in the desert.
Grissom, Sara, and Nick investigate the hug of a woman in the press box of a high school stadium. They arrive less than an hour after the woman's death. Catherine and Warrick try to determine the cause of an explosion in the DNA lab of CSI that seriously injures a lab tech. The personal lives of our characters come into play in this episode.
A professional bank robbery leads to the death of a detective. While investigating the case, Grissom deals with his hearing loss and another CSI gets a personal revelation.