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NBC’s This Is Us has added a new cast member in a recurring role, but the details of just who she will be playing remain under wraps. Jennifer Morrison, who previously stole our hearts as Emma Swan in Once Upon a Time, will be appearing in season four of the hit NBC drama. The Wrap reports that a source with knowledge of the production told them that information about this new character was being kept very hush-hush. That means if you want to know just which “us†this turns out to be, you’ll just have to wait. Horrifying, I know. But it’s only until the show returns to NBC on September 24th.