Theory:Doctor Who television discontinuity and plot holes/The Vanquishers

You are exploring the Discontinuity Index, a place where any details or rumours about unreleased stories are forbidden.
Please discuss only those whole stories which have already been released, and obey our spoiler policy.

This page is for discussing the ways in which The Vanquishers doesn't fit well with other DWU narratives. You can also talk about the plot holes that render its own, internal narrative confusing.

Remember, this is a forum, so civil discussion is encouraged. However, please do not sign your posts. Also, keep all posts about the same continuity error under the same bullet point. You can add a new point by typing:

* This is point one.
::This is a counter-argument to point one.
:::This is a counter-argument to the counter-argument above
* This is point two.
::Explanation of point two.
::Further discussion and query of point two.

... and so on. 

• One version of the Doctor stays on the station, another appears at the TARDIS as planned, and a third appears on Karvanista's ship because... why? why is there a third and why is the third there of all places?

There's a third Doctor simply because she's 'breaking every known law of physics', that's all the answer we need, there could have been 10. Why she appears on Karvistas ship is beyond me, the plot needed her too :/

• Why are the Sontarans back on Earth at all? With their temporal offensive a failure they have no need of the planet. the only thing they get from there are psychic beings, so why invade the whole planet and go to the trouble of killing al the Lupari? Couldn't they just pick up other, more gifted, psychic people from another planet? There must be other populated planets left over from the Flux.

• The Daleks and the Cybermen just come as the Sontaran's call?