SILENT BUT DEADLY WITH NUMBER TWO

This picture is from the photo galleries of the 'Doctor Who' Facebook group called "The High Council of Time Lords". And even though it's a "doctored" mash-up of old school Doctor (Patrick Troughton as the Second Doctor) with a new-Who monster (one of the Silence), it's still acceptable as having happened in the TV Universe... just off screen.

Because humans (and Time Lords) can't remember having seen one of the Silence after looking away, who's to say that all of the previous incarnations of the Doctor haven't encountered them before?

Since the Silence is the one alien race which could have infiltrated every TV series - and those shows' characters would never remember it - then I think it's a safe bet that the Silence will one day be inducted into the TV Crossover Hall Of Fame.

BCnU!