The degree to which an avid viewer of a TV show, cartoon, or internet series notices a slight change in style or content over an extended period of time is called "series drift". Often times, series drift is responsible for the waning of the popularity of such a program. Occasionally, series drift can have a positive affect in attracting a larger audience. In cases when series drift has a strong negative affect, the producers of the program in question may resort to jumping the shark.
The Simpsons series drift was evident once it became clear that Family Guy was indeed funnier.
by amadeus10101 September 19, 2008