When did Thunderbirds Season 1 Episode 21 air?
Thunderbirds Season 1 Episode 21 aired on February 17, 1966 at 7:30 PM GMT.


Thunderbirds are Go!
Thunderbirds is a 1960s British science-fiction television series which was produced using a mixed method of marionette puppetry and scale-model special effects termed "Supermarionation". The series is set in the 21st century and follows the exploits of International Rescue, a secret organization formed to save people in mortal danger with the help of technologically advanced land, sea, air and space vehicles and equipment, launched from a hidden base on Tracy Island in the South Pacific Ocean.

The Duchess of Royston has fallen on hard times, leading her friend Lady Penelope to enlist Jeff's help. The Duchess and her one asset – the painting Portrait of a Gazelle, by Braquasso – fall into criminal hands and it is up to International Rescue to save both.
Direct answers for episode-level questions and details.
Thunderbirds Season 1 Episode 21 aired on February 17, 1966 at 7:30 PM GMT.
This episode runs for approximately 50 minutes.
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