So he had to take you prisoner.
1 seconds sound clip from Scooby-Doo, Where Are You! - What the Hex Going On (S1E6).
You can hear this line at 00:20:23.088 in the Blu-ray version of the episode.
Quote context
[...]
- He thought he could scare you into giving up the family fortune.
- That ghostly wailing was only a recording.
- And by a clever use of makeup, he made himself look old.
- When I came downstairs to investigate a noise, I saw Uncle Stuart's wig blow off.
- So he had to take you prisoner.
- But where does the swami come in?
- What better way for a swindler to disappear?
- Uncle Stuart, why did you do it?
- Well, I guess he can explain it to the sheriff when he gets here.
- I bet you kids are starving.
- Groovy.
- Hey, what's this? Scooby-Doo was here. The whole turkey? Gone?
[...]