OK. Ha ha ha! I'm the mad scientist. You're Igor, my assistant, and we'll whip up a formula that will change werewolves into pussycats.
10 seconds sound clip from Scooby-Doo, Where Are You! - A Gaggle of Galloping Ghosts (S1E11).
You can hear this line at 00:14:40.822 in the Blu-ray version of the episode.
Quote context
[...]
- You jerk the sheet off, and I'll blast him with this, and he'll be one soggy ghost.
- Yes.
- Sorry about the free bath, Scoob.
- Give me a shot of that purple stuff, Igor.
- Yuck!
- Me, too.
[...]