Brianna and Roger will be introduced on Facebook/Outlander

Season 2 of Starz's "Outlander," based on Diana Gabaldon's "Dragonfly in Amber," will conclude on Saturday with Claire and Jamie being forced to part ways. The season finale will see Caitriona Balfe's character returning to the future, and Jamie staying behind as the Scottish rebellion gets intense.

The season finale will also feature the return of Geillis, the character essayed by Lotte Verbeek, who was last seen being burned at the stake for being a witch. In an interview last year, showrunner Ron Moore has revealed that viewers haven't seen the last of Geillis.

"It's a spoiler for people who haven't read the books," Moore told Zap2It. "It's a difficult question because it's sort of like Game of Thrones; if you've read the books, everything is fair game. If you haven't, you don't want to know anything."

Warning: This article contains spoilers from Saturday's episode of "Outlander."

As book readers might know, in 1968 Claire meets Roger Wakefield and tells him that one of his ancestors, William Buccleigh MacKenzie, was the child that Geillis and Dougal had. The finale will also reveal that Jamie did not die in the Battle of Culloden.

Previewing the finale, executive producer Maril Davis revealed to Access Hollywood that the final episode of the season is going to be emotional.

It's so heartbreaking. I don't cry anymore at playbacks because I've seen the stuff so much. I cried like three times. The music is wonderful, the writing is amazing. I mean Caitriona and Sam are heartbreaking. Get your tissues and your whisky because you're going to need it," she said.

Sam Heughan too said that the finale is going to be critical. "The time is getting so close to zero hour, to the point that they have to stop history from happening and whether or not they do is the spoiler."

The finale will see Claire realising she's pregnant and the future segment will introduce viewers to Brianna, Jamie and Claire's daughter.

Check out the trailer for "Dragonfly in Amber" below: