NINE
I'm with the psycho
This one makes my list based on the sheer brilliance and yet down right absurdity of it all. Mel 'I scream so much it actually affects my voice in later scenes' Bush, who was always so timid and nice, decides that she's not going to go off to help on a planet, or meet someone and get married, as we saw from Jo above. No! She's going to leave the safety of the TARDIS to run off to the stars with a sociopathic space pirate who was only moments before trying to kill off the human race AND, it turns out, sold his previous fellow travellers into slavery. Sane move, Mel.