Fans of Game of Thrones will remember the Night King (played by Vladimir Furdik) was killed by Arya Stark (Maisie Williams) to bring to an end the epic Battle of Winterfell.
His death seemingly wiped out the White Walkers and Winterfell celebrated the success well into the next episode of the HBO series.
Now, however, fans believe they be could about to make a huge comeback and it is all down to one child.
Samwell Tarly’s (John Bradley) lover Gilly (Hannah Murray) gave birth to Little Sam, a product of her forced relationship with father Craster (Robert Pugh), and fans think he might be a White Walker after a clue has emerged.
Gilly and Little Sam have White Walker blood in their veins
TurntCrawdad (Reddit User)
The boy was meant to be a sacrifice to the Night King, as all boys from Craster’s relationships with his daughters were.
However, he was saved from this fate by Samwell in heroic scenes.
As the series comes to an end, fans believe Little Sam is to make a huge comeback and be revealed as a White Walker.
Reddit user TurntCrawdad attempts to explain the theory behind it: "As we know, [George RR Martin's] writing is often influenced by the works of famous historical writers, as well as history itself. When I was reading about Gilly, I came to understand that her name originates from the real-life plant known as gilliflower/gillyflower.
"Gilliflower is mentioned in Shakespeare's A Winter's Tale, in which they are 'cross-fertilised by humans, rather than by Nature: I have heard it said/There is an art which in their piedness shares/With great creating Nature ... I'll not put/The dibble in earth to set one slip of them'.
“In genetics, the word 'pied' is used
