My sister and I just finished with our third characters in Marleybone, and she realized that there is a new character called "The Professor" standing outside of Scotland Yard with a red telegraph booth (as opposed to the good Doctor's blue phone booth). He's got the hat and the scarf--so it's definitely a Dr.Who-like character. My only question is...why? Please tell me we get to interact with the Professor because otherwise, it's sort of silly to tease us with him.