Another episode with more unanswered questions.
So the AI could just shoot these people through the head who couldn't run away? Why bother making slugs? . . . bang, the are all dead in minutes.
If it really had to kill them in alphabetical order just because of machine logic then why would a name change make any difference? The name in the computer is the name. Why would an AI care about doing it in an exact order anyway?
The door code delay . . . Jeez, that's poor maguffin writing. . . .
And, were they racists or elitist? This came out of nowhere and wasn't clear enough(the kids were all smiles, and then it was "ewww" scowls), if you want to make a point 'make it', don't half arse it. It could have easily been seeded earier. Plus the doctor had been down there with them for some time, surely this had already come up? Surely he saw their plan? Why did the doctors rescue attempts stop at P? Why didn't he care about saving anyone else? (the doctor this series has been quite blase / cold about anyone's death that has not been followed in his direct plot line)
What's annoying is that everything could have been solved with a bit of script editing. These are not Whiticker stories that are just crap from the off, 30 assistants running about with nothing to do. They are unfinished stories, plot markers with holes Inbetween.