The family Slitheen are outlawed criminals from the planet of Raxacoricofallapatorius. Wearing skin-suits of the British government, they planned to ruin the Earth and sell it on as rocket fuel. The attempt was foiled when the Doctor, Rose, Mickey and Harriet Jones (MP) diverted missiles into 10 Downing St. Blon Fel-Fotch Passameer-Day Slitheen was the sole Slitheen survivor, and – wearing the skin of Margaret Blaine - was elected Mayor of Cardiff. Foiling her Blaidd Drwg project, the Doctor caught her and threatened to return her home to her death. After a long negotiation, and taking Rose as a hostage, she stared into the heart of the TARDIS, and was reborn as an egg.