The whole plot of the 5-7 seasons is organized

The plot is actually like this: the bad guys fight with the mother star and the mother star intends to ignore the lower life and let the universe completely destroy itself and become a higher form of solitary life. The doctor chose to seal the home planet for the benefit of low-level beings, but he forgot about it and didn't remember it until 11. One day there is a crack and the home planet will come back, but the doctor needs to say the pass code to get it. Good guys and bad guys have to stop this, so the bad guys shoot at the planet where the crack is located, hoping to kill the current doctor, and the good guys travel back to the past and plan to kill the previous doctor, only to find that if they don't go back and blow up the tardis, there will be no crack at all. And the doctor stayed by the crack and told the bad guys that if you hurt this planet, I will immediately say the code, and if you don’t move, I won’t say it. There has been a stalemate for three hundred years. At this time the doctor was dying, and the mother star saw that he was really old and dead, and no one would be able to bring them back, so he planned to slowly renew the doctor's fee to let him live. 5 to 7 tells such a set of stories.

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