I'm sure that you've heard of Pandora's box but have you ever heard of the Pandorica's box. The Pandorica's box is a unbeatable defendable prison box which no-one can get out of or get in.
There was once a powerful alien whose name was the source. The source was said to be a mystical creature who was born in the stars and who would wreak havoc in the world. So one day Stonehenge suddenly burst open and the source rushed inside to destroy the Pandorica forever, so that he could not be imprisoned inside the deadly cage by his worst foe the Silurian.
All of a sudden the Pandorica flew open and inside sat the Silurian. The Silurian unlocked himself suddenly and grabbed the source and locked the source for 200,000 years. It is said that if you ever go near Stonehennge you can still hear the source screaming beneath your feet. Also on Doomsday the source will rise from the ground and explode the whole universe into tiny atoms which will be scattered all over in space and TIME!