Fatboy was an android concealing a nuclear weapon brought by Jode and Kala to Marpling in 1933 to retrieve a device capable of destroying worlds. Although Kala was willing to work with the Eighth Doctor to try and find another solution, Jode was soon convinced that there was no other way to find or stop the weapon and set Fatboy to detonate. Although it was impossible to order Fatboy to turn off the arming mechanism even after he saw the weapon be destroyed, a program limitation meant that he was completely immobilised for the last four minutes of the countdown to detonation, allowing the Doctor to disarm Fatboy manually. (PROSE: Eater of Wasps)

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