Howling:Who is the voice during events of the Pandorica opens and the Big Bang?

Who is the voice during events in the series finale in season five?

During events of The Pandorica Opens and The Big Bang,a voice is suddenly appeared out of nowhere telling the silence is falling.I think the voice is possibly Valeyard or his own alias,The Dream Lord.I'm speculating this because everyone fully aware of Valeyard's cunning skill and he maybe engineered this incident to get back on the Doctor.Or,this actually implied a catastrophic events that would eventually see our beloved Doctor fall to the dark side and becoming Valeyard.

If so,then everything will change and do not be surprised that the Doctor allied himself with his kind,Timelord or worse,the Master.The voice itself is actually a warning about the impending event that could not be altered unless a twist during the course of the Last Great Time War.

08:18, November 6, 2010 (UTC)180.73.162.247