Scooby-Doo, Where Are You! - Season 3 - Eps 1: Watch Out! The Willawaw!
Velma gets asked by her uncle Dave to visit. But while visiting, they find out that he's vanished. Then, they encountered the legendary Willawaw and two Owlmen who may be responsible for uncle Dave's disappearance. Legend has it if an owl calls your name, you'll be the next victim the Willawaw claims.
About Scooby-Doo, Where Are You!

Title: Scooby-Doo, Where Are You!
First Air Date: 1969-09-13
Last Air Date: 1978-12-23
Status: Ended
Rating: 7.818/10 (from 719 votes)
Language: EN
Seasons: 4
Total Episodes: 41
Network: ABC CBS
Genres: Animation, Mystery, Comedy, Kids, Family
Production Companies: Hanna-Barbera Productions
Synopsis
Fred, Daphne, Velma, Shaggy, and the talking dog, Scooby-Doo, travel on the Mystery Machine van, in search of weird mysteries to solve.
Cast

Casey Kasem
Shaggy Rogers (voice)

Don Messick
Scooby-Doo (voice)

Frank Welker
Fred Jones (voice)

Heather North
Daphne Blake (voice)

Pat Stevens
Velma Dinkley (voice)