Wikipedia
"D.P.O." is the third episode of the third season of television series The X-Files. The episode first aired in the United States on October 6, 1995, on Fox, being written by Howard Gordon and directed by Kim Manners. The episode is a stand-alone episode, like most episodes of The X-Files, and follows the normal Monster-of-the-Week pattern of the show. "D.P.O." earned a Nielsen household rating of 10.9, being watched by 15.57 million people in its initial broadcast, and received positive reviews.
The show centers on FBI special agents Fox Mulder ( David Duchovny) and Dana Scully ( Gillian Anderson) who work on cases linked to the paranormal, called X-Files. In this episode, Mulder and Scully investigate a series of lightning-related deaths in Oklahoma, which are eventually connected to the only person to have survived a lightning strike, an emotionally charged youth.
The original concept for the episode was a one line concept card stating "Lightning Boy" that had been tacked to a board in series creator Chris Carter's office since the first season. The episode contained several scenes of elaborate lightning effects. Notably, a "lightning machine" used for the sequence where Darin is struck by lightning was created by Special Effects Supervisor David Gauthier and buried under the ground.