Monica Julieta Reyes is a fictional character in the Fox science fiction-supernatural television series The X-Files. She is portrayed by Annabeth Gish. At first a Field Agent before becoming a Special Agent with the FBI, she works with her longtime friend and partner John Doggett in the X-Files office, which is concerned with the investigation of paranormal cases, dubbed "X-Files". Introduced in the series' eighth season, Reyes would become a main character throughout the entirety of its ninth season, before returning for a single-episode guest appearance in the tenth-season finale, and later in a recurring capacity during season eleven.