On Wikipedia, editors are not required to sourceuse secondary sources for plot summaries per [[MOS:PLOTSOURCE]]; the reasoning goes that {{tq|it is generally assumed that the work itself is the primary source for the plot summary.}} However, relying on this can lead to [[WP:No original research|original research]] and [[MOS:TVPLOT|overly long summaries]]. Sourcing plot summaries provides clear benefits in terms of overall encyclopedic value to the reader.
