High Quality Content by WIKIPEDIA articles! Samantha Ann Mulder is a fictional character in the television series The X-Files. She is the sister of FBI Special Agent Fox Mulder and the daughter of Teena and Bill Mulder. As a child, Samantha was abducted, ostensibly by aliens, and was never recovered. It is this experience that drives her older brother Fox Mulder to join the FBI, and later take the reins of the X-Files section.