Question about Martha (spoiler) and few other things.
Ok, just ended S3.
So they said that Martha and Jones are "errors" that shouldn't have happened in the original world.
While it's obvious for Jonas i don't understand why is that the case for Martha? (i didn't rewatch season 1,2 so maybe i forgot something).
2 more things were not covered: who built the time travel sphere that Martha was using and how was the fuel obtained? Why the son of Martha has the scar on different sides of the face? Just an inconsistency or has deeper but unexplained reasons?