AKA: Thete, Theta Sigma, Doctor John Smith.

Advantages: Charm and gadgetry, McGuffins: Floppy hat and very long scarf

Disadvantages: Easily irritated, patronising, overly facetious.

• You may be a doctor. But I'm the Doctor. The definite article, you might say.
• The trouble with computers, of course, is that they're very sophisticated idiots.
• I say; what a wonderful butler, he's so violent!
• If there's one thing I can't stand, it's being tortured by someone with cold hands.

• Would you like a jelly baby?
• Hello-o-o-o
• Off you go.
• Shut up, K-9!