Thunderbird 6 (1968)

Jeff Tracy: Now, let's have a rundown on the International Rescue craft. So far, there are five. Thunderbird 1: sleek, first and fast. Thunderbird 2: giant transporter. Carries all the rescue gear to the danger zone. Thunderbird 3: designed for space rescue. Thunderbird 4: capable of withstanding the pressure of the depths. Thunderbird 5: space monitor. Capable of receiving or intercepting distress calls from any part of the world. And I'm telling you, Brains, in no uncertain terms, that we now need a Thunderbird 6.
Brains: Sure, Mr Tracy, but can you give me some sort of a steer? I like to work to a specification.
Jeff Tracy: Specification? You didn't need to work to a specification when you designed that airship for the New World Aircraft Corporation.
Brains: That's right. I didn't. And what happened? They laughed.
Jeff Tracy: Yeah, that's right. They laughed... and then they built it.

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Virgil Tracy: [referring to the Tiger Moth inside the pod] I've got a Tiger in my tank.

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The Thunderbirds puppets are famous for their disproportionate appearance in both the TV series and the first film (Thunderbirds Are GO). For this, their final outing, the puppets were redesigned with closer to normal proportions.
Production on this film began after Gerry Anderson began work on Captain Scarlet and the Mysterons, a series that used far more realistic-looking Supermarionation puppets. Anderson reportedly considered making Thunderbird Six in the same style, but decided for reasons of continuity to retain the big-head style of puppets for the film. Apparently, some of the new style puppets are visible in some scenes.
In the first scene when all the men in the meeting room are laughing (which is the only time in any of Gerry Anderson's puppet series that this happens), you can see fillings in the teeth of one of the puppets.
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