[feigns ignorance] Me?! I've been standing here the entire time? I should be asking you that, Frank! But! I think it's time for me to go. You know how it is, one megalomaniac here, another planet being invaded there...

[gives Frank a sudden, serious pointed look] But don't think I'm letting you off. I will be back--and you'll be wishing you'd went to a nicer planet.

[and the Doctor drops back to the Plane]