Who ??-Heard of this time agency before?

[Mobile Vulgus]

Has anyone heard of this time agency before that they talked about in the Empty Child episode?

I don't know a whole lot about Dr. Who, but has there been other time travelling races or organizations (besides Daleks) in the series before?

[livewiremaxx]

Are you my MUMMY
Man that was a good episode.... totally had me freaked when I heard that. Now I cant get it out of my head