See Also: 'Assume Nothing' Episode Guide

Fans can now take a sneak peek at CSI: Crime Scene Investigation's fourth season.

CBS recently posted the promo video for the season premiere, "Assume Nothing", which reportedly revolves around a team of husband-and-wife serial killers, on its official web site. While it does not give many plot details away, the clip does reveal one major cosmetic change for the new season: Grissom's beard.

For those of you with slower connections, a transcript of the 30-second trailer can be found below:

THE NEW SEASON OF 'CSI' IS ABOUT TO BEGIN

[Police cars draw up at a crime scene.]

[A fingerprint graphic is superimposed over the shot as a gloved hand examines a body.]

[A woman stands silhoutted in a hallway.]

[Wide shot of Dr. Robbins examining a body in the morgue.]

AND ALL WE CAN TELL YOU IS: ASSUME NOTHING

[Grissom walks through a crime scene.]

[Focus pull onto a close-up of Grissom's face.]

[Text: 'Assume Nothing']

[Grissom steps through a doorway, shining a torch.]

Grissom (off-screen): "So they lure the victims with the promise of sex."

[Catherine shines her torch on a window.]

[A young couple locked in a steamy embrace.]

[Sara peers at a piece of evidence.]

Catherine (off-screen): "That's so twisted."

[Nick puts his head in his hands as he examines fingerprints on a computer.]

[Warrick and Catherine sit in the locker room.]

THE MOST ANTICIPATED SEASON PREMIERE

[Text: 'Most Anticipated Season Premiere' superimposed over images of Warrick and the CSIs walking through Las Vegas.]

[Nick peers down a stairwell.]

Warrick (off-screen): "How's the puzzle coming?"

[Close-up of gloved hands working on evidence.]

Nick (off-screen): "Puzzling."

[Grissom pulls off a cover and shines his torch down into a hole in the ground.]

[Grissom sits with his head in his hands.]

Grissom: "I screwed up."

WITH THE ENDING WE GUARANTEE EVERYONE WILL BE TALKING ABOUT

[The camera tracks towards a shocked Catherine.]

[Brass approaches with his gun at the ready.]

[Evidence graphics flash by quickly.]

[Close-up of Grissom staring intently.]

[Grissom peers into a car, where a dead man sits in the front seat.]

'CSI' CBS THURSDAY SEPTEMBER 25

[Text: 'CSI: Crime Scene Investigation - Season Premiere - September 25']

To view the trailer in streaming Real Media format, head over to the official CBS web site.

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