Some of the greatest narrative moments are arrivals. Han Solo says, “You’re all clear, kid.” Aslan storms the field with the White Witch’s prisoners quickened. Gandalf arrives at Helm’s Deep with the Rohirrim (or the men of Westfold, if you’re a purist). As portals fill the sky, the Avengers hear a voice say, “On your left.”

Arrivals like these bring change. The story turns with their appearing — and even more poignantly — they turn not simply on power, but power arrives on the wings of these relationships.