Frankly, I don't see what you kids can do. I don't have a single lead to give you.

4 seconds sound clip from Scooby-Doo, Where Are You! - Decoy for a Dognapper (S1E5).

You can hear this line at 00:03:50.505 in the Blu-ray version of the episode.

Quote context

[...]

- Yes. Bob's been grooming his dog for this show all year.

- But if that's the case, isn't the Great Dane in danger? He could be dognapped.

- Don't worry. I warned Bob, and he only takes the dog out for exercise at night, and then only on Beach Boulevard near the police station. It seems safe enough there.

- From now on, all dog owners must be on their guard.

- Mr. Masters, we're gonna find out who's stealing those dogs and why.

- Yep. Dognappers, beware.

- Frankly, I don't see what you kids can do. I don't have a single lead to give you.

- That's all right, Mr. Masters. We have a plan.

- Uh, we do?

- See this picture of the champion? This will help a lot.

- Come on, Freddy. Tell us, like, what's the plan.

- Yeah.

- Simple.

- We'll give the dognappers a decoy, and then when they grab the decoy, we'll trail them to their hideout.

[...]