Board Thread:The Reference Desk/@comment-63.143.217.227-20130412190138/@comment-2129131-20130412230747

Just a wild guess, but "Bad Wolf" sounds like something is lurking in the shadowy corners of the universe, threatening to rend it apart, much like a hungry wolf. It has no real meaning in RTD's descriptions, so pardon me if I've pulled a "curtains were blue" assumption, assuming too much out of something so simple. He probably wanted a phrase that would be memorable and a touch poetic.