Agent Fox Mulder is played by David Duchovny. In the series, Fox Mulder is a FBI agent who believes in the paranormal.
Agent Dana Skully
Agent Dana Skully is played by Gillian Anderson. Unlike her partner, Agent Skully believes in facts over paranormal.
FBI Assistent Director Walter Skinner
Walter Skinner is played by Mitch Pileggi. While working as the supervisor for the X-Files, Walter Skinner started of as being not very friendly towards Agent Mulder due to ulders belief in the supernatural.
Cigarette Smoking Man
The Cigarette Smoking Man is played is played by William B. Davis. The smoking has evolved at the beginning of the series from a random character to the main antagonist.