Roger also introduced his ancestor Buck MacKenzie (Graham McTavish) to Geillis, revealing she was his mother.
So, while Geillis could come back with a touch of time travel trickery, she does still seem to be very much dead and gone.
Whether the writers of the series will bring Geillis back at some point remains to be seen, particularly as it was the eighth novel in the series.
The programme-makers are focusing on season six, which is expected to be covering the sixth book A Breath of Snow and Ashes.
But there’s always scope to feature more from the books with the writers previously including plot points from other novels earlier in the story.
Outlander seasons 1 to 5 are streaming on Amazon Prime Video now