Directed by Cecilia Aranovich   Written by Michael Ryan   William Hanna   Joseph Barbera   John Dilworth   Joe Ruby   Ken Spears   Cast Frank Welker ... Fred Jones / Scooby-Doo (voice) Grey Griffin ... Daphne Blake / Frau Glockenspeil (voice) Matthew Lillard ... Shaggy Rogers (voice) Kate Micucci ... Velma Dinkley / Velma's Tablet (voice) Jeff Bennett ... General / Self Help Book (voice) Jeff Bergman ... Eustace / Computer / Mayor (voice) Marty Grabstein ... Courage / Clown / Mr. McGill (voice) Chuck Montgomery ... Lieutenant / Mr. Glockenspeil (voice) Paul Schoeffler ... Katz / Le Quack / Narrator (voice) Thea White ... Muriel Bagge / Rich Old Lady (voice) Produced by Cecilia Aranovich   Kip Brown   Jennifer Coyle   Dawn Merkel   Sam Register   Original Music by Andy Ezrin   Jody Gray

Additional Info Premiere: September 10, 2021 DVD Release: September 14, 2021 Country: Distributor: Warner Brother Studios Websites: Production Companies Warner Bros. Animation Cartoon Network Studios (uncredited) Distributors Studio Distribution Services (SDS)   (2021) (United States) (through) (DVD) Warner Bros. Home Entertainment   (2021) (United States) (DVD) Rating Stats Overall Rating 6.3 / 10 Our Rating -- / 10 Your Friends -- / 10 Male Users -- / 10 Female Users -- / 10 Site Ranking #7,071 / 21,102 Site Ranking #7,067 Kung Fu Panda: The Dragon Knight: Season 3 (2023) #7,068 Kung Fu Panda: The Dragon Knight: Season 1 (2022) #7,069 Zombies! Zombies! Zombies! (2008) #7,070 Lemora: A Child's Tale Of The Supernatural (1973) #7,071 Straight Outta Nowhere: Scooby-Doo Meets Courage The Cowardly Dog (2021) #7,072 Nightmare Man (2006) #7,073 Jean-Michel Basquiat: The Radiant Child (2010) #7,074 They Come Knocking (2019) #7,075 X-Men (2011)