Pig's Breakfast (TV series 1999-2000)

When an alien spaceship crash lands on Earth Rodney and his sister Lucy set out to help these aliens. They hide the fact that they are really aliens by having them on Kids Breakfast (nicknamed Pigs Breakfast) and putting it in their contract that they are never to show their real identity. Lucy acts as their manager. The spaceship is actually a school bus and Grob and Meeba are just children, with quigle as the driver. - IMDb