Bambera and Zbrigniev in “Battlefield”

Well done, Zbrigniev. Two civilians waltz up with a pair of antiquated pass cards and you let them in, why?

Sir...

You know something, what is it?

Off the record, sir?

Off the record.

When I served under Lethbridge-Stewart, we had a scientific advisor called the Doctor.

The man outside?

No, sir, but-

But?

He changed his appearance, several times.

A disguise...

No, sir. The word was he changed his whole physical appearance.

His whole appearance?

And his personality.

How can he be the same man if his appearance and personality have changed?

I don't know, sir.

What do you know, Zbrigniev?

Just that whenever this Doctor turns up....

Yes?

All hell breaks loose.