Part of the synopsis for the episode states Jon returns to The Wall and indeed we see that in the trailer, as the Lord Commander, along with those whove made it back from Hardhome with him, approaches Castle Black and is stared down by Alliser Thorne, who looks none-too-pleased to see hes survived the trip. Hell be even less happy when Jon tells of the events that went down at Hardhome, of the increasing threat of the White Walkers, and all the free-folk hes brought back with him. Well be seeing just how well-equipped Jon is to handle the rising tensions within the Nights Watch, something he may have to do without his closest ally.