The New Scooby-Doo Movies - Season 1 - Eps 5: Guess Who's Knott Coming to Dinner
When the gang stop at Moody Manor to get directions, they find themselves mistaken for Captain Moody's neices and nephews by an assortment of characters who all resemble Don Knotts.
About The New Scooby-Doo Movies

Title: The New Scooby-Doo Movies
First Air Date: 1972-09-09
Last Air Date: 1973-10-27
Status: Ended
Rating: 7.7/10 (from 252 votes)
Language: EN
Seasons: 2
Total Episodes: 24
Network: CBS
Genres: Animation, Mystery, Comedy, Kids, Family
Production Companies: Hanna-Barbera Productions
Synopsis
Aside from doubling the length of each episode, The New Scooby-Doo Movies differed from its predecessor in the addition of a rotating special guest star slot; each episode featured real-life celebrities or well known fictional characters joining the Mystery, Inc. gang in solving the mystery of the week. Some episodes, in particular the episodes guest-starring the characters from The Addams Family, Batman, and Jeannie, deviated from the established Scooby-Doo format of presenting criminals masquerading as supernatural beings by introducing real ghosts, witches, monsters, and other such characters into the plots.
Cast

Don Messick
Scooby-Doo (voice)

Casey Kasem
Shaggy (voice)

Frank Welker
Fred Jones (voice)

Nicole Jaffe
Velma (voice)

Heather North
Daphne (voice)