They land on Platform One, a space station orbiting the Earth, after the Doctor transports Rose to the year five billion. Lady Cassandra, who prides herself on being the last pure human despite numerous surgeries that have changed her appearance, is one of the elite extraterrestrial guests gathered to witness the destruction of Earth by the growing Sun. It is found that Cassandra intends to let the visitors die in order to get money for her numerous operations, and then she would profit from their competitors’ stock increases. Disguised robotic spiders that she distributes throughout Platform One begin to disrupt the systems. The spiders lower their shields as she teleports away, allowing dangerous direct sun radiation to enter the station. The Doctor manages to reactivate the system and save Rose, after which he brings Cassandra back and she ruptures from the intense solar heat.