- "I guess she had that coming. People like that cause accidents, they're a menace."
— Joe Carter
Thompson Tower – an entire city, contained in one enormous skyscraper – is opening for business when a car crashes through its massive underground car park, setting off a chain reaction that soon involves the entire tower in flames. As the local emergency services struggle to bring the blaze under control before the tower collapses, a family is discovered - trapped in the basement! International Rescue is summoned - but the Tracy brothers realize the only way of getting them out alive, is to use an unreliable new cutting gas developed by Brains...
- Main article: City of Fire/Storyline
- Main article: City of Fire/Transcript
International Rescue Equipment Used
Non-International Rescue Equipment Used
- Due to the show being first broadcast in production order in Australia, this was the third episode instead of The Perils of Penelope. This same pattern was also used when the show was rerun on BBC2.
- The Control Tower from London International Airport makes two sneaky cameos in this episode.
- Music from Supercar can be heard when Joe and Blanche find Tommy in the air-conditioning plant, and after the Tower Controller tells his assistant to alert the Fire Tenders and seal the vent cover.
- Main article: City of Fire/Goofs
In 1992, several episodes of Thunderbirds were adapted into comic book format for Fleetway's Thunderbirds The Comic series, with City Of Fire the fifth story. Written by Alan Fennell and illustrated by Steve Kyte, the 12 page adaptation began in issue #15 and was spread over 3 issues, emulating the presentation of the 1960's TV Century 21 stories.
- French: Au feu!
- German: Stadt in Flammen
- Spanish: Ciudad en Llamas; La ciudad de fuego (DVD)
- Italian: Un tragico incidente
- Dutch: Stad in vlammen (TV 1966); Stad van vuur (TV 1991, VHS); Vuurstad (VHS, DVD)
- Portuguese: Cidade em Chamas
- Japanese: 世界一のビルの大火災