'Game of Thrones'
A scene from "Game of Thrones" Season 6. Facebook/ GameofThrones

Leaked pictures from the production set of “Game of Thrones” Season 7 reveal a major House will be betrayed by one of its banner men. The cast and crew are preparing to film an important action sequence for the show, which could be the highlight battle next year.

[Spoiler alert]

The Lannisters will enlist the support of an unlikely ally in the next season. Leaked pictures from the set posted on Winter is Coming show soldiers of House Tarly lining up with Cersei’s (Lena Headey) army to defend against an attack.

The two armies are returning after they successfully sack Highgarden. It should be noted that House Tarly is supposed to be loyal to the Tyrells. According to the report, Randyll (James Faulkner) will betray his lord and side with the Lannsters.

The Tarlys have always been a strong House, and will now get a chance to wield real power. It should be noted that during the rebellion, Randyll was the only one who defeated Robert Baratheon (Mark Addy) in battle.

Randyll’s fight against the Tyrells may be an easy one in “Game of Thrones” Season 7, but that the joy of victory will be short lived. The Tarlys may not be able to enjoy the rich booty they loot from Highgaden.

While on their way to King’s Landing with their loot, the Lannisters and the Tarlys will be ambushed by Daenerys (Emilia Clarke) and her forces. She will be riding her dragon and her Dothraki horde will charge into battle on the ground. Given the scale of the attack and the fact that the army will be ambushed after they are exhausted from battle, the Khaleesi’s enemies may not stand a chance.

More pictures from the production set of “Game of Thrones” Season 7 have been posted on Watchers on the Wall. The battle is said to be featured in the fourth episode of the show next year and it will reportedly take up about one third of the episode.