The one where the computers says no...
OK, so I was wrong. Zondal does manage to fire the sonic cannon at Britannicus Base, and some damage is caused to the humans (well, a chandelier slips a bit, and some polystyrene falls from the ceiling). I take it back, Brian Hayles. For once, you did have the courage of your authorial convictions.
What I found most remarkable about episode 6 though, is how Walters suddenly springs out of his box and gets loads of lines, and fair dos, actor Malcolm Taylor grabs his chance and runs with it. Walters has a kind of breakdown by turning against Clent and his reliance on the computer, and threatening to smash it up. Sadly, Taylor's impressive soliloquy - performed with gusto, like Eddie Yeats in hyperdrive - is cut short by Miss Garrett's trigger-happy need to preserve the computer at all costs, and he's gunned down (but only stunned, like Penley last episode).