But before he disappeared into the sea, he shouted that he would return.
5 seconds sound clip from Scooby-Doo, Where Are You! - A Clue for Scooby Doo (S1E2).
You can hear this line at 00:05:04.329 in the Blu-ray version of the episode.
Quote context
[...]
- Beach hermit Ebenezer Shark claims it was the ghost of Captain Cutler who stole it.
- Ghost?
- Do you think that's what we saw last night?
- I don't know, but maybe that beach hermit Ebenezer Shark can give us a clue.
- Then let's pay him a visit tonight.
- But what makes you think it was the ghost of Captain Cutler?
- But before he disappeared into the sea, he shouted that he would return.
- So by causing the yachts to vanish from the marina, Cutler's getting his revenge.
- Aye.
- Come on!
- Zoinks! It's that ghost again!
- That's no ghost! It's just Scooby-Doo!
- It looks like your pooch found me old diving suit.
- Aye.
[...]