Game of Thrones returns next Sunday with the final episode of season four – a finale that the HBO series’ showrunners are convinced is their best yet.

Game Of Thrones Finale Spoilers

“It’s the best finale we’ve ever done, bar none,” Thrones showrunners David Benioff and Dan Weiss said in a statement. “The performances from our cast, the direction from Alex Graves, the VFX work, the new [music] cues from Ramin Djawadi—all of it came together in perhaps the finest hour we’ve produced. We’re immensely proud of 'The Children.’ And a little intimidated by the episode, because now we have to get back to the business of season five and figure out a way to top it.”

Leading into the finale, two of the series' main protagonists – Tyrion Lannister (Peter Dinklage) and Jon Snow (Kit Harrington) – are headed to what seems like certain death. Tyrion has been sentenced to death by beheading and Jon Snow is trekking out alone North of the Wall to find Mance Rayder (Ciarán Hinds). There’s also the uncertainty of Dany (Emilia Clarke) and Bran’s (Isaac Hempstead Wright) fates.

“An unexpected arrival north of the Wall changes circumstances,” reads the synopsis from HBO for "The Children." “Dany is forced to face harsh realities. Bran learns more of his destiny. Tyrion sees the truth of his situation.”

The “unexpected arrival,” if the series is to follow the books, will come in the form of Stannis Baratheon (Stephen Dillane) and his men who manage to help the Night's Watch defend Castle Black from the Wildlings. The action, of course, isn’t without ulterior motives. Stannis wants Castle Black and for Jon Snow to support his claims to the throne. In exchange, he’ll give him his father’s lordship of Winterfell.

As for the “truth” Tyrion sees, it could be that he’s found a way to avoid death and to perhaps get some well-deserved revenge. Again, if Benioff and Weiss follow George R. R. Martin’s novels, Tyrion will eliminate both his father Tywin (Charles Dance) and his former lover Shae (Sibel Kekilli) before fleeing Westeros for the Free Cities to escape persecution.

Game of Thrones “The Children” will air on HBO Sunday at 9/8c.

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> George R. R. Martin Talks About 'Song Of Ice & Fire' Series, 'Game Of Thrones'

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