The Doctor and Leela battle a virulent space swarm capable of taking over the minds of man and machine with just a static-y glance. As usual, the demands of the story greatly exceeds the resources of the production, especially when the Doctor and his companion are cloned, miniaturised and injected into the 'real' doctor's brain to hunt down and destroy a sentient viral invader (that looks something like a giant crayfish). Never-the-less, scenes like the shuttle landing on Titan, with Saturn looming overhead, however dodgy, are why I love science fiction films of any vintage and budget. The acting is generally good (albeit many of the secondary characters speak most of their lines in the standard monotone of the possessed), the doctor is at his cranky and supercilious best, and Louise Jameson gets develop her Leela the huntress character more than usual. As a bonus, we get K9's origin story, which actually explains why it (he, she?) looks like a dog. A fun episode that's best enjoyed at the moment (as it does not really stand up to post-hoc scrutiny).
Review of The Invisible Enemy: Part One
