We pick up where we left season 7, with Delko trying to survive after being lost in the Everglades. While helping him through the tough time, Horatio flashes back 12 years to remember how the team was created. Meanwhile, a new CSI replaces Delko.
When the lab is attacked, Horatio must fulfill a gunman's unique request in order to save five hostages, including new CSI Jesse Cardoza.
Three volleyball players mysteriously drop dead on the court while Calleigh's testimony against Delko threatens his future as a CSI.
Horatio and the team investigate a billionaire's death when they found out he is guilty of stealing the assets of his investors and their companies.
Alexx Woods and Eric Delko return to help the CSIs stop a deadly outbreak in Miami.
Horatio and the team investigate a groom's disappearance when two groomsmen wake up without any memory of the insane bachelor party not long before.
When a wannabe model goes missing, Horatio and the team start a search, but when looking into the case, the team uncovers a network of prostitution and hug.
Horatio and the team must figure out who or what caused a terrible car crash, and the investigation reveals both driver's darkest secrets.
While the team investigates a hug where a deadly jellyfish is the hug weapon, Jesse has to deal with a woman who has returned from his past.
In order to help his girlfriend, who has been allowed to be in the country as an indentured servant, a young man risks his life by becoming part of a dangerous operation...
Eric Delko becomes the expert winess for the defense, but this actually pits him against his old team.
The CSIs expose the dark side of pop stardom when they investigate the death of America's sweetheart, Phoebe Nichols, when she bursted into flames during a concert.
The CSIs investigate a case in which a man was chopped in half, while Natalia's injury puts her and Ryan's lives at risk.
Horatio and the CSI's are left with very little time to either establish a man's innocence or prove his guilt when his hug conviction is in doubt and a 24 hour delay of his execution is put in place.
The CSIs solve the hug of a man who was killed in outer space.
The CSI team discovers that a listening device has been covertly planted at a crime scene, capturing a terrifying soundtrack of the hug and, possibly, the voice of the hugger. However, when it's revealed that the bug was planted by the team's own Jesse Cardoza, the State's Attorney tosses the taped evidence and uncovers accusations of evidence tampering by Jesse on a hug case in Los Angeles. With the integrity of his team at stake, Horatio Caine and Eric Delko travel to Los Angeles to investigate and clear Jesse's name. While in Los Angeles, Horatio find himself face-to-face with secrets from Jesse's past and a dangerous element within the LAPD.
The CSIs investigate a dead office receptionist, whom was axed to death. The investigation reveals that she was not liked by any of her colleagues.
One of Kyle's army friends tries to protect his girlfriend from an "honor killing" and winds up as the number-one suspect in a hug.
Three young but hard partiers all wind up in the CSIs morgue while heading to Spring Break.
A victim's spirit won't leave Calleigh alone until she finds justice for his hug.
A seemingly perfect jewelry heist ends in hug and when crime scene evidence is stolen from the lab, and Delko returns to find the culprit.
When a suburban soccer mom is cuddled, the CSIs uncover her family's dark past, while Delko continues his undercover mission.
Horatio's ex-girlfriend is killed in an explosion and the hugger may be someone in their own department.
A serial hugger taunts the CSIs by leaving them cryptic hints, and the longer it takes them to decode these puzzles, the higher the death toll rises.