During the medieval period, Newgrange and the wider Brú na Bóinne Neolithic complex, gained various attributes in local folklore, which was often connected to figures from wider Irish mythology.

The episode plot serves as a "Monster-of-the-Week" story, which is unconnected to the series' wider mythology.

It is a Monster-of-the-Week episode, unconnected to the series' wider mythology.

Written by David Amann and directed by Rob Bowman, "Terms of Endearment" is a "Monster-of-the-Week" story, unconnected to the series' wider mythology.

Quikinna'qu or Kutkinnaku is a chief deity of the Koryak mythology, part of the wider Siberian mythology.

In addition, the season features a wide variety of "Monster-of-the-Week" episodes, which feature stand-alone stories not of influence to the wider mythology of the series.

Other episodes dealing with the wider mythology of the series-"Talitha Cumi", "Piper Maru" and "Apocrypha"-explore similar concepts, showcasing the shadow government plot line of the series.

Written by Charles Grant Craig and directed by Kim Manners, "Oubliette" is a "Monster-of-the-Week" story, unconnected to the series' wider mythology.

The episode is a "Monster-of-the-Week" story, unconnected to the series' wider mythology, or overarching fictional history.

It is a "Monster-of-the-Week" story, a stand-alone plot which is unconnected to the series' wider mythology.