...Sewer rat!

Ratigan:
I have the power! Robot Queen:
Of course you do. Ratigan:
I am supreme! Robot Queen:
Only you. Ratigan:
This is my kingdom! [maniacal laugh] Ratigan:
That is, of course, with your highness' permission. [the robot is idle; Ratigan slaps it to start it again] Robot Queen:
Most assuredly... you insidious fiend. Ratigan:
What? Robot Queen:
You're not my royal consort! Ratigan:
[to crowd]
Such a sense of humor. Robot Queen:
You're a cheap fraud & impostor! Ratigan:
[under his breath]
Flaversham! Basil:
[operating the robot]
A corrupt, vicious, demented, lowlife scoundrel. There's no evil scheme you wouldn't concoct. [the robot goes crazy and breaks apart] Robot Queen:
No depravity you wouldn't commit. You, professor, are none other than a foul stenchus rodentus, commonly known as a... Ratigan:
Don't say it! Basil:
...Sewer rat!