With the hosts Merv Griffin, Pat Sajak, David Letterman and Stephen Colbert, CBS has taken many runs at late-night TV. Some were more successful than others.

Late night talk shows in recent years haven't been quite as much of a staple of network television like in the days of David Letterman and Jay Leno, but CBS' move against The Late Show with Stephen Colbert will still come as a shock to many.