Slitheen Technology

The Slitheen use a load technology to hide and infiltrate planets so they can make money.

Compression Field
The compression field is a device which goes around the Slitheen's neck allowing them to fit inside the skins of whatever species they like! A side effect of using the cheaper version of the Compression Field is farting, burping and other unpleaseant things.

The cheaper versions of the compression field allows them to use obese aliens as disguises. The newer compression field allows them to disguise themselves as thinner aliens.

When the Slitheen are unmasking a bright blue light appears coming from the skin. This light is the releasing of the Slitheen's compression in the skin-suit.

Other species or robots use them e.g. The Teselecta use it to miniaturise its crew so they can fit in.

Spaceship + Space Pig
The Slitheen own a Spaceship with a slipstream engine which means it can travel faster than light - they have much more advance tehnology than humans! The spaceship crashed into Big Ben as a diversion which hide the bigger threat which had already arrived on Earth before!

The Slitheen ship was piloted by a pig. This pig was modified by the Slitheen so it could withstand the impact from the spaceship crashing. It was put into a spacesuit as well!