5 important things you probably missed on this week's 'Game of Thrones'

Warning: spoilers ahead for Sunday's episode of "Game of Thrones,""Oathbreaker."

The Starks are certainly undergoing a resurgence.

Sunday's "Game of Thrones" not only followed up on the resurrection of Jon Snow (Kit Harington), but it also brought back another Stark, Rickon (Art Parkinson). We also saw both Bran Stark (Isaac Hempstead-Wright) and Arya Stark (Maisie Williams) progressing in their respective training.

And as the family builds itself up again, there are plenty of other moments on this week's episode that point to big theories surrounding the Starks, the Lannisters, and other families.

Here are five important things you probably missed on this week's "Game of Thrones":

SEE ALSO: 'Game of Thrones' star teases her character's future: 'She's not the old Melisandre yet'

DON'T MISS: 6 things that lie ahead for Jon Snow on 'Game of Thrones'

The prince who was promised.

Melisandre (Carice van Houten) had mistakenly thought that Stannis Baratheon (Stephen Dillane) was "the prince who was promised." Since Jon Snow's resurrection was a success, she seems certain that he is who the prophecy speaks of.

But what is the prophecy? "The prince who was promised" is the second coming of a great hero named Azor Ahai. Ultimately, he will save Westeros from the White Walkers — the zombie-like dead that return during the long night, darkness that lasted a generation — like Azor Ahai had done centuries before.

But to become that, Jon Snow has to fulfill several duties of the prophecy. 

The Little Birds.

Referred to in the books, the "Little Birds" got their first appearance in the show on Sunday's episode. They belong to Varys' (Conleth Hill) large network of spies. Seemingly innocent street children, the Little Birds are the source of a lot of information.

The significance of Rickon Stark's return.

Rickon Stark has been away from the show even longer than Bran Stark. The last time we saw him on-screen before Sunday's episode was during season three. He was last seen escaping with former Stark servant and "Free Folk" member Osha (Natalia Tena) for Last Hearth to seek protection from Stark loyalists at the House of Umber.

Fearing a war with Jon Snow and the wildlings, though, the Umbers have turned Rickon and Osha over to Ramsay (Iwan Rheon). Could this be the end of the line for Rickon? Is there a hidden plan here to overthrow Ramsay?