The CSI team suspects foul play when a chemistry teacher's science experiment goes horribly wrong. Guest stars include Marissa Jaret Winokur as Principal Dawn Meadows, Skipp Sudduth as Ed Lusk and Bella Thorne as Hannah Hunt, a student. (TV-14 V)
Sara and Greg are quarantined after responding to a crime scene that's contaminated with a deadly pathogen. (TV-14 V)
The CSI team investigates a robbery and fatal shooting at a medical marijuana shop. (TV-14 V)
Finlay must deal with a bomb planted in her car, while Russell gets a call from someone claiming to be the Gig Harbor killer. Mark-Paul Gosselaar guest stars as twins Jared Briscoe and Paul Winthrop, and Mark Valley guest stars as Detective Daniel Shaw. (TV-14 L, V)
Csi: Crime Scene Investigation: Season 11 clip - starring Laurence Fishburne, Marg Helgenberger, George Eads, Paul Guilfoyle, Eric Szmanda, Robert David Hall.
The appearance of a sudden man on fire at a high school has the CSI's thinking if it was an accident or a case of murder.
As Russel wonders about the case that got away, Nick and Det. Crawford walk into a case of witchcraft.
With his mother gone, Russel checks in on Mason.
A mothers best intentions goes wrong as a spell to cure a disease takes the lives of two others.
The CSI team is at a crossroads as their lead suspect is caught under water.
Blood leads the CSI team to a High Wiccan Priest.
D.B. and Julie discuss whether or not the Twins are working together to commit these murders.
Greg and Sara occupy their time as they wonder if yesterday was the last day of their lives. Meanwhile, Nick finds his patient zero.
As a dangerous virus appears on the streets of Vegas, the CSI team race against the clock to save Greg and Sara.
Greg is awakened to a missing Sara and wonders the worst.
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