See Also: 'Play With Fire' Episode Guide

CBS Thursday night released the promo for the penultimate CSI episode of the season, "Play With Fire".

In the episode, a massive explosion destroys part of the Las Vegas crime lab and injures Greg and Sara. Could one of the CSIs be responsible?

The 30-second trailer is available for download at the official CBS site. For those of you with slower connections, a transcript follwos:

CBS THURSDAY

[Text: 'Thursday']

[Shot of Grissom shining a torch.]

THE MAIN EVENTS ARE ON CSI

[Text: 'The Main Events']

[Brass and Sara prepare to enter a suspect's apartment with a squad of police officers.]

[Text: 'CSI: Crime Scene Investigation']

[The squad bursts in through the door, weapons at the ready.]

Brass: "Nobody move!"

THEY'VE HELPED PUT A LOT OF CRIMINALS BEHIND BARS

[Shot of Sara as she enters the apartment.]

[Brass knocks the suspect to the floor, where he rolls about.]

[Sara aims her gun at the suspect as he thrashes around.]

[In DNA, Greg is talking with Grissom.]

Greg: "Killer, victim, location."

[Close-up of Grissom.]

Grissom: "The holy trinity, Greg."

[Grissom walks along a corridor in the crime lab with David Hodges.]

BUT NOW, THEY'RE ABOUT TO BECOME THE VICTIMS

[Grissom discusses evidence with Greg and Catherine.]

[Sara walks along a corridor, and pauses momentarily.]

[Greg is standing in DNA, when a massive fireball explodes behind him.]

[The fireball explodes out into the corridor, hitting Sara who tries to shield herself.]

[Greg is thrown through the glass wall, collapsing onto the ground.]

[Close-up of Greg as he lies on the floor.]

AN EXPLOSION WILL ROCK CSI

[Paramedics rush the injured to safety.]

[Close-up of Greg's scarred face.]

[A hatchway is lifted up.]

[Warrick talks to Catherine.]

Warrick: "Who blew up the lab?"

[Catherine stares back at him.]

AND WHEN THE SMOKE CLEARS

[Overhead shot of the damaged lab.]

[Close-up of Grissom as he contends with the crime lab's director.]

[The director delivers a stern warning to Grissom.]

Director: "It's not your job to protect your people."

YOU WON'T BELIEVE WHO'S RESPONSIBLE

[Shot of Sara.]

[Shot of Nick.]

[Shot of Grissom.]

[Shot of Catherine.]

[Shot of Warrick.]

[Grissom defends himself to the crime lab's director.]

Grissom: "Without the people..."

[The director leans towards Grissom.]

[Angle on Grissom.]

Grissom: "...there is no lab."

CSI - ALL-NEW - CBS THURSDAY

[Text: 'CSI: Crime Scene Investigation - New Episode - Thursday 9/8C']

Download the trailer in Real Media format at CBS.com.

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