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In page Retroactive continuity:
"Unpopular stories are sometimes later ignored by publishers, and effectively erased from a series' continuity. Later stories may contradict the previous ones or explicitly establish that they never happened.[citation needed] In television, when a character is subtracted with a retcon, this is often known as "Chuck Cunningham syndrome," after a character from the series Happy Days that was retconned out of existence shortly through the series run,[1] or "going to Mandyville," after Mandy Hampton, a character that suffered a similar fate in The West Wing.[2]