KOSAT 5 was a communications satellite launched into Earth orbit by South Korea in late 2023. Its launch made the entirety of humanity able to access the Internet for the first time.
The satellite's launch was the trigger for the activation of the Giggle, a waveform created by the Toymaker and implanted in all screens from the moment of the invention of television. The signal caused worldwide chaos as almost all humans were influenced to believe they were always right, all the time. KOSAT 5's connection to the signal led UNIT to scan the satellite, but it came up clean, with nothing hidden inside like the Archangel Network of old.
When the Fourteenth Doctor and Donna Noble returned to Earth, they were quickly called upon by UNIT to assist with the crisis. With all world leaders affected by the Giggle, Kate Stewart asked for and received the Doctor's permission to destroy KOSAT 5 in the hopes of stopping the signal. The satellite was manoeuvred onto a new orbital path that took it above the city of London, where UNIT shot it down with a galvanic beam from their headquarters. However, the signal had already taken hold, and this had no effect.
UNIT was concerned about potential diplomatic repercussions from destroying KOSAT 5. (TV: The Giggle [+]Loading...["The Giggle (TV story)"])