The intellectual sparring between FBI agents Fox Mulder (David Duchovny) and Dana Scully (Gillian Anderson), partners investigating paranormal cases known as the X-Files, fueled this Fox sci-fi drama from 1993 to 2002. He was a believer in the supernatural. She was a skeptic and medical doctor. Eventually, they fell in love. And she became a believer when they discovered a government conspiracy to cover up an extraterrestrial invasion.