The official trailer for “The Crown” Season 4 proves Gillian Anderson’s introduction as British Prime Minister Margaret Thatcher will forever shakeup the Netflix royal drama series. Anderson’s galvanizing performance dominates the new look at the upcoming season, as does the introduction of rising actress Emma Corrin as Princess Diana. The long-awaited debuts of Thatcher and Diana are set to revitalize the Netflix series with newfound buzz.

Per Netflix’s official synopsis for “The Crown,” the new season “picks up in the late 1970s as Queen Elizabeth (Colman) and her family find themselves preoccupied with safeguarding the line of succession by securing an appropriate bride for Prince Charles (Josh O’Connor), who is still unmarried at 30.”

“As the nation begins to feel the impact of divisive policies introduced by Britain’s first female Prime Minister Margaret Thatcher (Gillian Anderson), tensions arise between her and the Queen which only grow worse as...