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After a series of unusual occurrences during a hiking trip in North Carolina, a husband and wife retire to bed. Three days later, their skeletons, locked in a final embrace, are found in a field located in an area infamous for its "atmospheric phenomena." While attempting to solve the mystery, Mulder and Scully also try to determine the origin of a luminous, gooey yellow secretion -- but this is only the tip of the iceberg. Written by Vince Gilligan and John Shiban, "Field Trip" originally aired May 9, 1999.