Should the 'plot' section be a full summary, or a preview / promo of the story?

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I have just added a "Plot" section, and for now I have added it as a preview - sort of like what you might read on the back cover of a book you're about to read. Should the plot in fact tell the entire story or should it be an introduction to what the movie is about?

Full including ending. Pick up a readers encyclopedia and it will tell you the whole story. See also the Wikipedia project film guidelines. See also WP:SPOILER
What you can do is include line and paragraph breaks in the summary so that anyone interested can read the first paragraph or so without giving away the ending. -- Horkana (talk) 05:21, 28 April 2010 (UTC)Reply