Featured Session: Game of Thrones - 2017 SXSW Conference and FestivalsThe Stark sisters are together again on "Game of Thrones" -- and also on Apple Music's "Carpool Karaoke."

With the new series set to premiere Aug. 22, Apple Music released a new preview Tuesday featuring two of the upcoming season's guests: Maisie Williams and Sophie Turner. In the 30-second promo, the "Game of Thrones" co-stars and onscreen sisters get into singing Justin Bieber and Miley Cyrus songs, but the real highlight is when they decide to surprise some of their show's fans.

"They're the most loyal fans in the world, and I think we should go and surprise them," Turner says.

Together, the actresses show up at HBO: The Escape, an "immersive escape-the-room style experience" that the premium network brought to Austin's South by Southwest in March. There, we see them cover themselves in cloaks and get ready to terrify-slash-thrill unsuspecting visitors.

Watch the preview below.

Apple Music's "Carpool Karaoke" premieres Aug. 22 on the streaming service.