I wonder why Martha didn't. I guess they needed to divorce the two of them utterly to take such a dark path. But it wasn't as fun to watch.
Martha's kinda an object lesson in why companions need to see the Doctor screw up early on. Because, often, the one-off guest stars are left with the impression that the Doctor is somewhat godly (like the family here) and that doesn't tend to affect his view of himself much. But if his companion views him that way, then the breaks that Rose and Donna have shown themselves able to put on his behavior are missing (and the Time Lords are no longer there, in the back of his mind, influencing his choices). And Martha doesn't really understand that until the very last episodes.
For all his power and knowledge, the Doctor is fallible. He'll do things like promise to take care of and protect one of the most dangerous men in the universe because he's lonely.
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Martha's kinda an object lesson in why companions need to see the Doctor screw up early on. Because, often, the one-off guest stars are left with the impression that the Doctor is somewhat godly (like the family here) and that doesn't tend to affect his view of himself much. But if his companion views him that way, then the breaks that Rose and Donna have shown themselves able to put on his behavior are missing (and the Time Lords are no longer there, in the back of his mind, influencing his choices). And Martha doesn't really understand that until the very last episodes.
For all his power and knowledge, the Doctor is fallible. He'll do things like promise to take care of and protect one of the most dangerous men in the universe because he's lonely.