Helena Bonham Carter's Margaret Is a Scene Stealer in The Crown Trailer

In the upcoming season of The Crown, Queen Elizabeth II (Olivia Colman, taking the throne from Claire Foy) is preparing for the Silver Jubilee marking her 25th anniversary of rule -- an occasion that is described as "as grueling as the queen's coronation."

However, all eyes are on Princess Margaret, now played by Helena Bonham Carter, in the new trailer of the Netflix period drama. Carter has several scene-stealing moments in the first extended look of the much-anticipated third season, in which she asserts her own authority against the power of her sister.

"Elder sister, younger sister. Number one or number two?" states Tony Armstrong-Jones (Ben Miles), Margaret's then-husband.

"Who's number one?" Margaret asks.

"You. She knows it too." Armstrong-Jones replies.

"Yes, I think she does." Margaret says, as an iconic shot of her in a bathtub wearing a crown fills the screen.

Season 3 depicts a shaky time for the British monarchy; it is set between 1964 and 1977, when Harold Wilson served as prime minister for two terms. The queen expresses her own insecurities with her reign in the trailer. "In the time I've been on the throne, what have I actually achieved?" she says. "This country was still great when I came to the throne. All that's happened on my watch is it's fallen apart."

In the trailer, Margaret says it is the monarchy's duty to "paper over the cracks," yet fissures are forming elsewhere in the royal family. Prince Philip (Tobias Menzies, replacing Matt Smith) appears stormy, while Prince Charles (Josh O'Connor) grapples with adolescence, a romantic attraction to Camilla Parker Bowles (Emerald Fennell), and disapproving relatives.

Watch the trailer below, and see the new season of Netflix's The Crown on November 17.