Slitheen

The Slitheen were a family of Raxacoricofallapatorian criminals. The Slitheen were rivals (and "cousins") of the Blathereen family, (TV: The Gift) cousins of the Rackateen family and descendants of the Slavereen who were descended from the Changleen family, the earliest descendants of the Huspick Degenerate. (WC: Monster File: Slitheen) The Slitheen family made a habit of going to Earth in attempts to salvage it to make money. (TV: Boom Town, Revenge of the Slitheen)

The Slitheen were from Raxacoricofallapatorius originally and bribed their way into government. Their rule crashed the planet's economy and eventually, the population rose up against them. (TV: The Gift) The entire family was tried and found guilty in perpetuity and sentenced to death. (TV: Boom Town) The Judoon forced the Slitheen out and many of them fled justice. (TV: Revenge of the Slitheen)

In 102, the Slitheen were among the factions who joined the Alliance. They came to Stonehenge and helped imprison the Eleventh Doctor in the Pandorica to save the universe. (TV: The Pandorica Opens) When the plan failed, they were turned to dust and removed from the universe along with the rest of creation. They were returned when the Doctor "reset" the universe. (TV: The Big Bang)

21st century edit
In March 2006 the Passameer-Day branch disguised themselves as various humans holding leadership positions and attempted to seize control of the British government in an effort to start a nuclear war. Their ultimate aim was to turn the Earth into a huge nuclear reactor pile and sell its remains off as starship fuel. This attempt was foiled by the Ninth Doctor when he ordered Mickey Smith to shoot down Downing Street with a missile. (TV: Aliens of London, World War Three)