Earth Death
Earth Death, also known as the end of the world, was the name given to the event in the year 5.5/Apple/26, better known as 5,000,000,000, in which the planet Earth was ultimately destroyed, having been engulfed by the Sun as it became a red giant. It was attended by guests who were, as the Ninth Doctor put it, worth "zillions".
At Platform One, Earth Death was scheduled for "15 39". (TV: The End of the World)
Prelude
As the Sun expanded, the Earth was completely vacated by its former inhabitants, namely humanity, who by the year 5,000,000,000 were said to have "touched every star in the sky". The mother and father of the Lady Cassandra O'Brien.Δ17 were said to be the last to be buried in the Earth's soil.
By this point, the now uninhabited planet was the property of the National Trust, who kept it preserved by using gravity satellites to hold back the Sun while reversing the shifting continents to a classic Earth formation. Ultimately, however, the Trust ran out of money to the Earth preserved and so, as the Ninth Doctor put it, "nature took over". (TV: The End of the World)
The Event
The coming destruction of the Earth, named "Earth Death", was designated as an "artistic event" to be witnessed aboard the observation deck Platform One, a space station owned and placed in orbit of Earth by the Corporation and staffed by Crespallions, who were managed by a Steward. The main sponsor for the event was the Face of Boe of the Silver Devastation, who invited several guests to witness the event. As the Ninth Doctor observed, these guests were mostly extra-terrestrials or multiforms and composed of "the great and the good" or rather "the rich", being worth "zillions".
The guests in attendance, transported via shuttles, were the Earth tree-descended Forest of Cheem, represented by Jabe, Lute and Coffa, the Moxx of Balhoon from the solicitors Jolco and Jolco, the Adherents of the Repeated Meme from Financial Family Seven, Hyposlip Travel System inventors the brothers Hop Pyleen, Cal "Spark Plug" MacNannovich, Mr and Mrs Pakoo, the Ambassadors from the City State of Binding Light. Lastly, a special guest called forth in memory of the dying world was the Lady Cassandra O'Brien.Δ17, the so-called "last human"; the last "pure" human, Cassandra regarded the others of this time as "mongrels". In addition, the Doctor's TARDIS landed aboard the station as the Doctor took Rose Tyler, a human from 2005, on her first trip; using his psychic paper, the Doctor passed himself off to the steward as a guest with Rose as his "plus one".
Cassandra used metal spider robots to sabotage Platform One's computer systems and the Adherents of the Repeated Meme, who were actually android constructs, to direct attention away from herself as the spiders sabotaged the platform's sun filter. Her original intent was to create the appearance of a hostage situation and collect compensation (with it not being apparent she was the hostage taker) to fund her cosmetic surgical procedures.
When that plan was exposed by the Doctor, she teleported off the station, leaving it to be consumed, eliminating both the evidence and allowing the shares she held in the guests' rival companies to triple. Among those killed by the heat were the steward, Raffalo, a Crespallion worker, the Moxx of Balhoon, and Jabe, who gave her life to assist the Doctor. Ultimately, thanks to Jabe's sacrifice, the Doctor reset Platform One's systems, saving the station, and also reversed the teleportation feed, bringing Cassandra back. In the heat, and without her assistants to moisturise her, Cassandra's skin dried, stretched and exploded, apparently killing her, although her brain was not destroyed. (TV: The End of the World)
