But here's the problem - how do you map that story onto an episode of an ongoing TV show? How do you reveal that the entire world including your star is actually a simulation, an alien dream world, and end up still having a show next week? It's tricky, and I'm not sure the show quite pulled it off. The fact that this Doctor was not, in fact, our star but a digital copy of him is necessary to avoid the huge reveal that the whole universe of the show is fake, but it simultaneously cheapens the entire premise.