Episode 1.2 of Doctor Who
Directed by Euros Lyn
Script by Russel T Davies
45 minutes 2005
Christopher Eccleston plays the Doctor
Billie Piper plays Rose
Zoë Wanamaker voices Cassandra
Country of finance: UK
Nationality of director: Welsh
Location of story: a spacestation
Filming location: Cardiff
Channel: BBC Wales
The Doctor takes Rose billions of years into the future to witness the end of the Earth as the Sun expands and destroys it. Observation is from a space station, and the guests are the super-rich. One of the guests is Cassandra, who has had 708 operations and is now just a stretched face. She is described as the last Earthling (which of course ignores the two minions who move her frame and frequently moisturize her).
Cassandra is also the bad guy. She releases robot insects which destroy the station's protections so that all will die and she will make a killing having bet against the other guests on the stock exchange. She teleports out at the last minute, but is brought back by the Doctor.
Incidentally, Casandra who uses makeup and mentions various ex-husbands is obviously to be taken as female, started out as boy. This makes her one of the more rococo specimens of the old film favourite, the transy killer.
Zoë Wanamaker was unable to be in Cardiff when the episode was filmed. Cassandra was originally voiced by Eve Myles, and Zo's voice added later.
Of course referring to this series as number 1 is high revisionism. The original season 1 of Dr Who was back in 1963.