103: Wet Foot/dry Foot
Weekend fishermen catch a tiger shark and discover a partial human torso in its stomach, but Horatio and Megan also find a bullet slug in the remains, suggesting murder. A tattoo on the torso arm reveals the victim was a political prisoner from Cuba, and the CSI's also discover an abandoned boat with a matching bullet slug in the transom and a false wall for drug smuggling.
104: Just One Kiss
Horatio and his team investigate a rape/murder case on a Miami beach. The female rape victim is hospitalized, while Horatio and Megan process the dead male, found with his throat cut and a burn on his cheek. Calleigh, Delko and Speedle recover bloody shards of glass and an eyeglass nosepiece with traces of blood at the scene.
A toddler found wandering alone in the street leads Horatio and his team to a suburban nightmare, an entire family shot to death in their home. The mother, teenage son, infant, and nine year old son are all dead, only the father and the toddler survived. Using only the blood evidence found on the toddler and throughout the house, the CSI's must follow the evidence to establish a timeline and sequence of events to catch the killer.
109: Kill Zone
Three individuals are shot and killed in downtown Miami during morning rush hour and Horatio, noticing all three were shot in, above, or between the eyes, in the "Kill Zone," realizes it's a sniper. At the lab, Calleigh tells Horatio the bullets were encased in plastic, making it impossible to trace ballistics to a specific weapon.
110: A Horrible Mind
A professor from a local university is found hanged in a tree, and his body exhibits 62 different wounds, indicating he'd been tortured before the hanging. Horatio learns the professor taught a course entitled "The Evil of Mankind, Violence Through the Ages" and utilized controversial teaching methods, i.e. dressing as Hitler, KKK guest lecturers, etc.
115: Dead Woman Walking
Horatio and his team investigate a junkie/mugger found dead with a broken neck lying atop a pile of cash. At the lab, Alexx and Horatio discover the victim's hand is literally burning off and realize he's been exposed to radiation. Horatio sounds the fire alarm, and CSI is evacuated, except for Horatio, Alexx and Delko who have been exposed.
122: Tinder Box
Speedle and Delko enjoy a hot Miami night spot "Club Descent," until the DJ's pyrotechnic display triggers a fire that engulfs the club in flames, creating panic and horror, killing 16 people and wounding 58 others. Speedle and Calleigh follow the pattern of the burn to its source and find the dead body of a bartender who'd been stabbed to death before the fire began.
123: Freaks And Tweaks
Horatio, Speedle and Delko are almost killed when Delko triggers a "booby trapped" explosive device while investigating the beating death of a meth amphetamine "Tweaker". "Tweakers" stay up days at a time, fixated with disassembling clock radios and appliances, or reassembling them into other devices.
124: Body Count
Horatio and Speedle investigate an inmate murdered in the yard at Miami West Detention Center, and witness a bold daylight escape, as three inmates are taken away in a helicopter. Numerous inmates switch ID bracelets, to conceal the escapee's identities. Later, the helicopter is found, but the pilot and one inmate are found shot dead at the scene.