Now I must go. The scent of crime is in the air.

5 seconds sound clip from the Darkwing Duck - Darkly Dawns the Duck: Part 1 (S01E01) movie soundboard.

You can hear this line at 00:01:27.321 in the DVD version of the TV Series.

Quote context

[...]

- Let's get dangerous. (2)

- Darkwing Duck. Better watch out, you bad boys! Darkwing Duck.

- This is the city of St. Canard. Like any other major metropolis, it has its problems with the criminal element.

- Another order of dastardly delinquents deposited on your doorstep, courtesy of Darkwing Duck. That's two words, not three, both D's capitalized. Here's my photo.

- If the papers need more glossies, my number's on the card.

- Now I must go. The scent of crime is in the air.

- So where's the press? I thought this was the age of media glut. Where's the Action News van when you need them?

- And I spent all afternoon ironing this cape.

- Yes! Another night cleansed of its criminal element, thanks to Darkwing Duck!

- Uh! I can't wait to hit the hay.

[...]