Several CBS primetime shows will be available ad-free and on-demand just hours after they air.

Starting in January, US cable operator Comcast will offer CSI, NCIS, Survivor and The Amazing Race on their VOD service. The shows, which go out as part of CBS's primetime lineup, will be available on the service from around midnight each night for 99 cents. Because new seasons of Survivor and Race debut in March, Survivor: Guatemala and Race: 8 will be available on the service at launch.

"This is an incredibly exciting evolution for CBS and network television -- video on demand is the next frontier for our industry, and we are thrilled to be partnering with Comcast in taking this giant, positive leap forward," said CBS chief Les Moonves. "We're offering hit programming that is extremely well-suited for this new medium, and we're confident the lure of watching these shows at one's own convenience, will make this feature wildly popular. From its days as one of the first radio broadcasters to its leadership in HDTV, CBS has always been on the cutting edge of broadcasting technology, and this latest development further distinguishes us as the undisputed industry leader."