Don't you believe it, J Gander. This fiend is my archnemesis, NegaDuck.
4 seconds sound clip from Darkwing Duck - Just Us Justice Ducks Part1 (S1E20).
You can hear this line at 00:12:33.087 in the DVD version of the TV Series.
Quote context
[...]
- The Spocko 650 Pie Gun produces so many pies, I can't even tell you.
- Sorry, DW. I know I left my keys in here somewhere.
- NegaDuck, so you're behind all of this.
- Don't you believe it, J Gander. This fiend is my archnemesis, NegaDuck.
- Oh, no, you don't. You're the lecherous liar known as NegaDuck.
- I beg to differ. You're the erroneous executor of evil known as NegaDuck.
- Ooh... would you cut that out!!
- Well, I guess we'll just have to kill them both.
[...]