|Function:||Mans Thunderbird 5|
|Date of birth:||October 8th, 2001|
|Voice artist:||Ray Barrett|
|Source:||Thunderbirds 1966 Annual|
Fair and handsome, twenty-five-year-old John is the dreamer of the Tracy household.
An electronics expert with a degree in laser communications, John is the quietest and most intellectual of all the boys.
His favourite pastime is to study astronomy and his job as space monitor gives him ample opportunity to pursue this hobby.
The discovery of the Tracy quasar system was due to John's incessant space searching, and four astronomy and outer space textbooks bearing his name have been published.
Slighter in build than his brothers, John is a tremendously lithe and graceful person. At school he obtained many awards for athletics which he insists has attributed to his clearness of thought and mental abilities.
Following in his father's footsteps, John became an astronaut after leaving Harvard University. This experience was invaluable when he returned home to become involved with International Rescue, for when Alan Tracy relieves him in the space station the command of Thunderbird 3 is handed over to John.
Raymond Charles "Ray" Barrett (2 May 1927 — 8 September 2009) was an Australian movie actor. In the 1960s he was a leading actor on British television, where he was best known for his appearances in The Troubleshooters (1965–1971). From the 1970s he appeared in lead and character roles in a number of Australian TV series and films.