- "Seventeen, black. Seventeen, black. Oh, come on, seventeen, black!"
A Trip to the CasinoEdit
In a French Casino, while playing roulette, the Duchess is spotted by an old friend (Lady Penelope), she tells her that she has lost everything, except her precious Braquasso painting "Portrait of a Gazelle". Two crooks, Chandler and Brophy, overhear their conversation.
Lady Penelope realizes that the table is fixed and causes a scene, but the crooked casino owner escapes with the Duchess's money.
The Braquasso Painting ArrangementEdit
Lady Penelope invites Wilbur Dandridge to her home for a meeting with the Duchess of Royston. She will not sell at any price but does finally agree to a rental arrangement, insisting that she ferries the painting to New York herself.
A Trip to AmericaEdit
Tied up in a CellarEdit
The Duchess is tied up in the basement of an old house and the crooks engineer a gas leak as they make off with the painting.
In the Duchess' attempts to free herself, she causes the gas to explode and the house begins to crumble around her. The St Christopher homing device alerts International Rescue that something is wrong, and soon Thunderbirds 1 and 2 are soon at the scene.
The Duchess is taken to hospital, were she is visited by Wilbur Dandridge. He revels the fate of the Braquasso painting, but the Duchess is unconcerned for that painting was a copy. The real painting was rolled up inside her umbrella the whole time.
A magazine wants to buy the Duchess's life story, and as soon as she is back on her feet, she is back in the casino.
The Duchess of Royston, lived in Royston Castle , but had to put in on the market due to gambling depts.
- The face and voice of the Duchess are based on those of actress Dame Edith Evans.
- The Duchess (or rather, her puppet) later makes a couple of cameo appearances at the Paradise Peaks Hotel in The Cham-Cham. First, she is seen sitting in the cocktail lounge, and shortly after, Cass Carnaby has a portrait of her hanging on the wall of his dressing room.
- The portrait image appeared again on the front page of the Foxley Heath Times, in the Thunderbirds 1965 episode The Stately Homes Robberies.
- Her puppet also appears twice in the movie Thunderbirds Are Go: first at the press conference, wearing her yellow sweater, and again later, at the nightclub Swinging Star, wearing her blue dress.