Jon hatches a risky plan to travel beyond the wall with a ranging party of a dozen men to capture a wight in hopes that a live demonstration of the threat will convince Cersei Lannister to lend her men in the fight against the Night King. They succeed in the endeavour, but the group faces an army of White Walkers on their return trip. Jon sends Gendry running back to Castle Black to send a raven to Daenerys who arrives with her dragons to save the men from ambush. Unfortunately, the foolhardy endeavour gets Thoros the Red Priest and a bunch of other Northern allies killed, including Daenerys' dragon Viserion.