Situation: Critical! is the fourth in a series of seven Thunderbirds novels released by FTL Publications in the United States. Published in November 2010, the paperback novel was written by Joan Marie Verba, and features a new adventure starring John Tracy.


What starts out a normal and peaceful day for John Tracy becomes a battle for Earth's survival, when a mysterious object bombards the planet with comets and meteors.


John Tracy, the third of Jeff Tracy's sons, coordinates communications for International Rescue on the space satellite Thunderbird 5, in addition to piloting the rocket ship Thunderbird 3 and assisting with Earth-based rescues. An experienced astronomer, John discovers a new planetary system and realizes its gravity has sent meteors and comets hurtling toward Earth. John and the rest of the International Rescue team find that this is only the beginning of the disasters they must handle, which affect them as well as the rest of the world. Can they save the Earth, and themselves, from catastrophe?[1]

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"This is an exciting adventure and close to my heart, having plenty of astronomy–a story that could carry on into further books. It is great to see John getting a more prominent part. These stories continue to get more and more exciting and further expand the Thunderbirds universe. I look forward to new adventures." –David Tremont, Model Maker, Weta Workshop.

"In Situation: Critical, Joan Marie Verba pits International Rescue against a plausible natural disaster–meteor and comet fragments careening toward Earth–and delivers an exciting and suspense-filled yarn that stands alongside the best episodes from the classic Thunderbirds TV series." –David Lee Summers, author of The Solar Sea


  • For the first time in the series, John pilots Thunderbird 3 solo.


  1. Synopsis by FTL Publications