Blake's 7, Series Two

Avon:
I have been doing some calculations, if this is Star One...

Blake:
If it is?

Avon:
First catch your computer, but all right it probably is, and that being the case the choice of location is fascinating.

Blake:
I'm glad you're enjoying it.

Avon:
The nearest large galaxy to our own is Andromeda.

Blake:
So?

Avon:
So, this is the nearest point to Andromeda. If anyone could cross intergalactic space in less than a lifetime we are now precisely upon the route that they would take.

Blake:
What are you trying to say, Avon?

Avon:
I directed the detectors toward the Andromeda galaxy. There are thousands of satellite generators out there... beyond Star One.

Blake:
What?

Avon:
Even with the Federation's resources it must have taken them years.

Blake:
[examining a readout] That must be the biggest antimatter minefield ever put together!

Vila:
Minefield, what minefield?

Avon:
Perhaps the intergalactic drive has been developed. The question is, by whom?

Blake:
A defense zone to keep mankind in, or something else out.