In which an important and fascinating new character shows up... but not for long. Martha is saying goodbye, but the Doctor's hand-in-a-jar violently teleports the TARDIS to an alien planet. (In case you're wondering why he keeps that thing next to the control panel, there's a very good reason for it.) Since the "Doctor Detector" only does that sort of stuff in rare situations, it could only mean two things: either the Doctor himself is on that planet, or something exactly like him. Of course, they're followed by various Humans and Hath, both shooting at one another as well as our heroes.