Blon Fel-Fotch Passameer-Day Slitheen

Blon Fel-Fotch Passameer-Day Slitheen was a member of the criminal Raxacoricofallapatorian Slitheen family who took the skin of the Human MI5 member Margaret Blaine when her family attempted to trigger a nuclear war on Earth, in order to devastate the planet and sell the radioactive remains as starship fuel. (DW: World War Three)

Blon escaped the destruction of 10 Downing Street and became mayor of Cardiff, beginning the Blaidd Drwg nuclear power plant project above the Cardiff rift to destroy Earth, not to sell as fuel, but with the purpose of using a tribophysical waveform macro-kinetic extrapolator to "surf" into space. (DW: Boom Town)