Sure! Obviously if someone hasn't seen that serial and doesn't want to know plot details, this is the time to bail out of this comment. :)
At the beginning of the story, you see the Doctor talking to some shadowy creatures on another ship, and he's acting like he's going to do something for them. Then he and his companion Leela arrive on Gallifrey and he proceeds to claim the Presidency (which actually was his, he just hadn't wanted it before) and act like a complete tyrant, verbally abusing the other Time Lords, making them do things with no explanation, and allowing these alien creatures access to the Citadel. Oh, and he has Leela kicked out of the city. It becomes clear that he's collaborating with the aliens to give them control. What isn't revealed until later is that everything he has done is to get the aliens into a position where they can be defeated, but he couldn't tell anyone about his plans because the aliens are telepathic. Even exiling Leela was to get her into a position where she could help him the most.
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At the beginning of the story, you see the Doctor talking to some shadowy creatures on another ship, and he's acting like he's going to do something for them. Then he and his companion Leela arrive on Gallifrey and he proceeds to claim the Presidency (which actually was his, he just hadn't wanted it before) and act like a complete tyrant, verbally abusing the other Time Lords, making them do things with no explanation, and allowing these alien creatures access to the Citadel. Oh, and he has Leela kicked out of the city. It becomes clear that he's collaborating with the aliens to give them control. What isn't revealed until later is that everything he has done is to get the aliens into a position where they can be defeated, but he couldn't tell anyone about his plans because the aliens are telepathic. Even exiling Leela was to get her into a position where she could help him the most.