Lord Mountbatten

Louis Mountbatten is the family's grandest elder statesman — war hero, last Viceroy of India, uncle to Philip and eventual mentor to Charles. He arrives already certain of his own importance, full of advice nobody quite asked for, needling at the throne's edges with charm, ambition, and a very long memory.

The show uses him as the voice of naked ambition inside a family built on restraint, and both actors lean into that contrast — Greg Wise's brisk vanity, Charles Dance's weathered, watchful pride. He's never simply likeable, but he's never boring either, a man who treats royal duty as a game he intends to win.