The ending was really forbobing, you could sense something bad was going to happen to them, just like the homeworld. Not sure wat it is tho, maybe it has something to do with this "empire of death".
I was a bit taken aback about wat happened to Ricky September but wasn't too surprising in retrospect considering how she was the whole episode. "I got sore fingers from working 2 hrs a day""i can't walk without the bubble". Blocks the Doctor when they try to earn her. Complains about having to physically look around without the bubble. one of her friends says he can't get get in contact with some of his friends. "your no fun". So selling someone who was helping her so save her own skin shouldn't have been so surprising.
No wonder the AI started killing them off, having to deal with people like Lindy 24/7 would drive anyone mad. Can't believe I'm saying this but I kinda feel a bit sympathetic to the AI.