- "I fail to see why you're still laughing, Virgil. I just don't like mice, that's all."
— Lady Penelope Creighton-Ward
A year after The Hood's first attempt to steal the secrets of an Australian nuclear power plant ended in disaster, he's ready for another go - but, this time, with a very different, and utterly unorthodox, approach...
Having stolen a new anti-espionage device called the "Mighty Atom" - cleverly disguised as an ordinary-looking mouse - he uses the high-tech little creature's photographic acumen to secure detailed images of an atomic plant in the Sahara Desert.
Flushed with his new success, he decides to take his nefarious plans one big step further - by deliberately sabotaging the installation, to lure out International Rescue...
- Main article: The Mighty Atom/Storyline
- Main article: The Mighty Atom/Transcript
International Rescue Equipment Used
Non-International Rescue Equipment Used
- The Mighty Atom is noteworthy for being the only series episode in which all five Thunderbirds craft appear (excluding the feature films).
- This episode also marks the first appearance of Thunderbird 4
- It's also the only episode in which all of the series' major characters appear (the Tracy (7) and Kyrano families (3, including The Hood), plus Brains, Penelope and Parker - 13, in all!).
- Originally a half-hour episode filmed in late 1964, it was extended in mid-1965.
- For subsequent 'cliffhanger' formats broadcast in some countries, the first installment ends with The Hood gloating in his temple that the secrets of the world will soon be his.
- The Target Carrying Aircraft first seen in Trapped in the Sky returns, and is used by the Australian Atomic Station workers to escape from the nuclear explosion at the start of the episode.
- The Conference Hall's exterior set makes an appearance, and would go on to be reused in Cry Wolf, The Impostors, and Ricochet as entirely different buildings.
- The newspapers seen rolling off the presses after the radioactive cloud is blown away are actually copies of the Coventry Evening Telegraph.
- Not only one the very few times Thunderbird 2 is seen flying without a pod; this is the only series episode in which Thunderbird 2 lands without a pod.
- At the meeting with Professor Holden, The Hood has assumed the guise of one 'Professor Langley'.
- This is the only episode where the first line of text ("The") is in a smaller font size than the next line of text ("Mighty Atom").
- First out of Three episode plot that features Australia.
- Main article: The Mighty Atom/Goofs
- French: Sabotage à l'usine atomique
- German: Die Supermaus
- Spanish: El poderoso átomo; El átomo poderoso (DVD)
- Italian: Nube sull'Australia
- Dutch: De geheime foto's (TV) De machtige atoom (VHS, DVD)
- Portuguese: O Átomo Poderoso
- Japanese: 原子炉の危機