Sonequa Martin-Green has taken over the captain's chair in the fourth season of, and the actress couldn't be more excited about the opportunity and her character's growth.«It was exhilarating, it was solidifying, it was cementing and fulfilling in so many ways,» Martin-Green shared with ET's Nischelle Turner. «I felt as if I had arrived, or sort of reached the pinnacle of what this season is about.»With her character, Michael Burnham, in command, she's become the first black female captain in the franchise's history.