Batman and Robin. Starsky and Hutch. Hasselhoff and his talking car. Prime time has always featured plenty of crime-busting partners. And this week, two of TV's toughest solo acts — Gil Grissom (William Petersen) and Jack Malone (Anthony LaPaglia) — join forces to catch a killer in a special CSI-Without a Trace crossover. Inspired by the real-life saga of a murderer who rode the rails to hunt his victims, the story begins on CSI, when a murder investigation by Grissom's team turns up a link to a case that Jack and the FBI have been pursuing for years. Their search takes them from Las Vegas to New York City, and "the difference in our styles becomes apparent right away," LaPaglia says.

http://www.tvguide.com/cover-story

That was a good episode. Jack and Gil are like oil and water. Funny pairing.