“If an extraterrestrial is sending you a message, it’s the equivalent of two plus two equals four.” They really did say that.

There’s a scene in this episode when he explains wormholes to DI Flint, and it may as well have been set in the Queen Vic

Paradox is, if you apply any kind of deep analysis to it, illogical nonsense built on foundations of bog roll. But is it fun? Yes, I think it is.

I've not even mentioned the plasma screens the Beeb rustled up just to show a big ticking countdown. The tension of the episode would have been crippled without those.