If perhaps you don't know what I'm talking about here I will tell you. I'm talking about the Zygons, aliens with heads shaped like ravioli, who disguise themselves by assuming the appearance of humans.
Would anyone care to have a discussion on these highly appetising creatures, and also if the concept is possible in real life. What I mean is, could there be some 'humans' amongst us who aren't what they appear to be?
“You may be a doctor, but I'm The Doctor, the definate article you might say”