Trivia: Although he is the main villain, the Hood appears in only six episodes throughout the entire series.
Trivia: There were a lot of changes to the show throughout the second season. Not only was Virgil "re-cast" with both a new head and voice actor (Jeremy Wilkin), but smaller, more lifelike puppet hands were crafted on the marionettes, and the inside of Tracy Island and the Thunderbird crafts were completely redone.
Trivia: Fenella Fielding was Gerry Anderson's first choice for the voice of Lady Penelope.
Trivia: In the opening credits, you see a picture of Thunderbird 3 in the background, but Alan Tracy is not flying the craft. He in is fact flying Thunderbird 2 with the steering wheel upside down.
Trivia: The Hood's name was never used in the TV series. It was revealed in spin-off media and promotional materials.