Glen Morgan and James Wong's early influence on The X-Files mythology led to their introduction of popular secondary characters who would continue for years in episodes written by others, such as the Scully family: Dana's father, William ( Don S. Davis ); her mother, Margaret ( Sheila Larken ); and her sister, Melissa ( Melinda McGraw ).

Glen Morgan and James Wong's early influence on The X-Files mythology led to their introduction of popular secondary characters who would continue for years in episodes written by others, such as the Scully family — Dana's father William ( Don S. Davis ), mother Margaret ( Sheila Larken ) and sister Melissa ( Melinda McGraw )— as well as conspiracy-buff trio The Lone Gunmen.

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