"The age of man is over, Doctor. The age of the virus has begun."

Oh dear. Time to run this file through McAfee then?

No. Fret Not. These words are spoken by a giant prawn to a Time Lord, just after exiting his body through his tear duct. Yes, this can only be Tom Baker's bonkers brain-centric epic, The Invisible Enemy.

Wherein the Doctor and Leela, in reduced circumstances, wander about inside the Gallifreyan's brain, hotly pursued by a hairy-eyed Hitler. Signs are spelt orl rong, a certain metal dog makes his debut as a violent virologist and a behemoth of a bottom-feeder gets pushed around on a skateboard, presumably in search of a suitably large barbeque upon which to end his days.

Now where did I put that Thousand Island dressing…?