Aliens of London (1)

Location: London, Earth
Date: March, 2006
Enemy: Slitheen
The  Doctor and Rose return to modern-day Earth, only to find it has been a year since Rose first set off, and everyone thought she was missing, presumed dead. Whilst there, a spaceship crashes into Big Ben and lands in the Thames. Soon, all is not as it seems with the residents of 10 Downing Street.