'Game of Thrones' Drops Intense New Season 7 Trailer -- Can the Houses Fight Together?

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It's time for the houses to decide who their real enemies are.
HBO dropped the new trailer for Game of Thrones' highly anticipated -- and long overdue -- seventh season, which teases a major clash of the kingdoms, all while the seasons-long looming thread of the White Walkers appears poised to finally come to a head.
"For centuries our families fought together against their common enemy, despite their differences." Jon Snow (Kit Harington) says in the ominous two-minute spot. "We need to do the same if we're gonna survive."
Check out the trailer below.
Winter is officially here.
Game of Thrones returns on July 16.
Meanwhile, one unexpected face you may see amidst the epic battle between Dynaerys (Emilia Clarke) and her Dragons, the Starks and the Lannisters, is none other than singer-songwriter Ed Sheeran!
Watch the video below to see what the "Shape of You" artist revealed to ET about his cameo.