The Wetherby fortune belongs to me. Unless it is returned to this mansion before morning, the entire family shall suffer this terrible fate.
11 seconds sound clip from Scooby-Doo, Where Are You! - What the Hex Going On (S1E6).
You can hear this line at 00:03:53.133 in the Blu-ray version of the episode.
Quote context
[...]
- Look! Someone's in the shadows!
- Aah!
- I went past the Kingston Mausoleum and finally into the old mansion.
- And there is where I saw the ghost of Elias Kingston.
- That's when he made me an old man as a warning to you all.
- First of all, I'm going to call the sheriff.
- That's strange. The phone's dead.
- Why don't you go get the sheriff, Mr. Wetherby? We'll wait here.
- We'll keep an eye on Uncle Stuart until you get back.
[...]