High Quality Content by WIKIPEDIA articles! FBI Special agent John Jay Doggett is a fictional character in the American Fox television series The X-Files, a science fiction show about a government conspiracy to hide or deny the truth of alien existence. With his FBI partners Dana Scully (season 8) and Monica Reyes (season 9) they work on the X-Files office together, which is concerned with cases with particularly mysterious or possibly supernatural circumstances that were left unsolved and shelved by the FBI. Portrayed by the American actor Robert Patrick, Doggett was a main character from the eighth to ninth seasons (2000–2002), replacing David Duchovny`s character Fox Mulder. Doggett appeared in the opening credits and every episode from the season eight premiere to the series finale.