Fox Mulder is a fictional character from the television series The X-Files, created by Chris Carter. He is an FBI agent known for his belief in the paranormal and extraterrestrial life. Mulder often investigates unsolved cases involving unusual phenomena, driven by a personal quest to find his missing sister, who he believes was abducted by aliens. Mulder is characterized by his intelligence, skepticism of government, and a strong sense of justice. He frequently collaborates with his partner, Dana Scully, who provides a scientific perspective to their investigations. Together, they explore various conspiracy theories and uncover hidden truths throughout the series.