a new friend for the doctor

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Which character from the previous series of doctor who or torchwood do you think would make a good companion for the doctor? Personally i think captain jon hart would be great,hes funny and cool,hes a little too "grown up" for doctor who but i reckon hed be ace.Who do you think would be good.If im totally honest id still rather have Donna back any day though,i hope they do bring her back somehow