If it hasn't already been suggested, then you knew it was coming. Rick is in his garage working on things that you don't want to know about when all of a sudden a blue box appears in the drive way. As the garage door opens, the Doctor confronts Rick concerning any one of a dozen innocent species that are now extinct shortly after Rick visited their worlds. One thing leads to another and the two become entangled in a battle of wits and tech. We'll assume both have been preparing for this battle. Who wins?