The Mythology is Chris Carter's visionary story arc of "The X-Files" comprised of 60 episodes from all nine seasons of the show. In Black Oil, even as Scully searches for the truth behind her abduction, an alien autopsy tape leads her and Mulder to a professed group of women abductees who all have chips identical to the one found in Scully's neck. Then, while investigating a series of deaths connected to a sunken World War II aircraft and a mysterious black oil, Mulder encounters Alex Krycek, who claims to have a digital tape documenting the existence of extraterrestrials. A second encounter with Krycek leads Mulder to Siberia, where an unidentified object crashed into Earth in 1908. Yet for all the seemingly undeniable proof, when agents are asked to verify the remains of a 200-year-old-alien, they finally discover just how far the government will go to make Mulder believe.

This four-disc set includes the following episodes:
3x09: Nisei
3x10: 731
3x15: Piper Maru
3x16: Apocrypha
3x24: Talitha Cumi (with optional commentary by Bob Goodwin)
4x01: Herrenvolk
4x09: Tunguska
4x10: Terma
4x15: Memento Mori (with optional commentary by Rob Bowman)
4x17: Tempus Fugut
4x18: Max (with optional commentary by Kim Manners)
4x21: Zero-Sum
4x24: Gethsemane
5x02: Redux
5x03: Redux II