The Man From MI.5 is the 20th produced, and the 17th broadcast, episode of the British television series Thunderbirds.
Plot[]
Aboard Thunderbird 5, John Tracy receives an unusual appeal for International Rescue's assistance - from the British Secret Service! In response, his father Jeff dispatches IR's own spy-in-residence - Lady Penelope Creighton-Ward - to investigate...
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The Man From MI.5 on Thunderbirds Wiki:
https://thunderbirds.fandom.com/wiki/The_Man_From_MI.5