[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/thunderbirds_mi5_man.jpeg]]
[[caption-width-right:300:There's spy among us.]]
JustForFun/TheOneWith that [[SugarWiki/AwesomeMusic awesome spy theme song]].

Aboard his luxury yacht in the harbour of Monaco, a British agent in possession of secret papers is brutally gunned down. The papers are stolen and the yacht is blown-up, taking it to the bottom of the harbour. While the British Security Service quickly determines that this was murder and not an accident, they are unable to progress the investigation. The leader of the investigation calls up International Rescue, who are not able to help. Jeff Tracy does however, set up a meeting between Lady Penelope and [=MI5=]'s agent, Bondson.

While Lady Penelope quickly identifies those responsible, she's hampered in her investigation after they tie her to a chair and place a timed explosive by her feet. The explosion should draw off the investigators and allow the criminals to escape in their submarine (as the area is under surveillance, due to the yacht explosion). Unfortunately for them, the crooks hadn't counted on the fact that everything Lady Penelope owns has a radio in it and International Rescue arrive rapidly to save their friend. Thunderbird 1 brings Scott to save Lady Penelope from the bomb, while Thunderbird 4 pumps the submarine full of knockout gas and retrieves the stolen papers.

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* AffectionateParody: Of the ''Film/JamesBond'' franchise, complete with the spy-theme music. Lady Penelope's frequent use of [[MagicalAccessory Magical Accessories]], CoolCar and recurring espionage role made the departure into the genre feel surprisingly natural.
* BewareTheNiceOnes: After Lady Penelope leaves Bondson's car, Bondson tries to glance at Penelope, only for Parker to fire a warning shot at Bondson.
--> '''Parker''': The lady said, "''[[PunctuatedForEmphasis Don't! Move!]]''"
* CoolBoat: This is the only time we see ''[=FAB=] 2'', and she's a pretty sweet yacht. Unfortunately, we don't get to find out if she has any of the gadgets of her car counterpart.
* DamselInDistress: [[InvokedTrope Invoked]] by Lady Penelope, who acts like a clueless airhead and lets herself be captured so that she can discover the spy's plans and communicate them to International Rescue. She does still need to be rescued before the bomb set to kill her goes off, so it ends up being a case of BadassInDistress.
* {{Expy}}: Of James Bond... with the inventive name of Jimmy Bondson. He even looks a bit like Sean Connery.
* HandSignals: To warn International Rescue without letting the enemy agent that is with her know who she is, Lady Penelope uses a special form of signal language that to an outside observer looks like she is just putting on make-up.
* MacGuffin: The stolen papers.
* HumiliatingWager: Parker has a hard time confessing to Lady Penelope, that he accidentally gambled away her yacht in the Casino.
* ShoePhone: Lady Penelope's powder-compact communicator.
* SpyFiction: Way further up the Martini end of the scale this time.
* StiffUpperLip: Lady Penelope remains calm and unimpressed, even when she is shot at, taken captive and eventually tied up and left behind with a bomb. The enemy agent that abducted her even lampshades it.
* WeNeedADistraction: The spies that stole the papers plan to blow up a boathouse (with Lady Penelope inside) to distract a police boat so that their submarine, which is on the bottom of the harbor, can leave unnoticed.