The silents

The silents are enemies of the eleventh doctor. They are based on slenderman, a german myth about a shape shifting monster who kidnapps children. They are also based on The scream, a painting full of weird creatures.

The question
The question is what the silents fear most. The silents belive that if the question is asked Silence will fall (in other words, the univerce wil end).

In the episode The wedding of River Song, Dorium Maldovar , a talking head , told the doctor that the question was the first question ever , and it had been following the doctor ever since the events of An Unearthly child. He also revealled that the question was ''Doctor Who? ''