Doctor Who and his friends go to an airport, where they are attacked by this guy.
He's an alien, but he's pretending not to be. That space gun is a giveaway, though. Idiot.
Later, the guy catches Polly. Here she is, being terrified of his space pencil.
She leaves the show in this story. I think having to pretend to be scared of 'space pencils' was the final straw.
Look! A faceless one. He's really gross looking. Literally no face.
That's why he wants to kidnap people who have got faces. Or as he calls them, "the face-y ones".