The Ninth Doctor takes Rose five billion years into her future. They land on Platform One, a space station in orbit around Earth. They have arrived in time for a party celebrating the final destruction of the long-abandoned Earth by the expansion of the Sun. The Doctor uses his psychic paper to pass as their invitation to the party, and he and Rose find many elite alien beings there. The guests include Lady Cassandra, billed as "the last human", though she remains only a face on a large piece of skin that must be continually moisturised, with her brain in a vat below. Also present is the Face of Boe.