Scooby-Doo, Where Are You! - Season 1 - Eps 6: What the Hex Going On?
The gang sees a strange man go into a weird mansion. They learn that he is a friend of their Uncle Stewart. Stewart tells them that the ghost of the Kingston Mansion caused him to turn old. Strange things start happening when Sharron and Uncle Stewart vanish.
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)