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Amanda Seyfried
Daphne Blake (voice)
Christina Hendricks
Officer Jaffe (voice)
Frank Welker
Scooby-Doo / Pterodactyl (voice)
Mckenna Grace
Young Daphne (voice)
Gina Rodriguez
Velma Dinkley (voice)
Justina Machado
Jamie Rivera (voice)
Zac Efron
Fred Jones (voice)
Ariana Greenblatt
Young Velma (voice)
Will Forte
Shaggy Rogers (voice)
Mark Wahlberg
Blue Falcon (voice)
Iain Armitage
Young Shaggy (voice)
Pierce Gagnon
Young Fred (voice)
Henry Winkler
Keith (voice)
Jason Isaacs
Dick Dastardly (voice)
Kiersey Clemons
Dee Dee Skyes (voice)
Ken Jeong
Dynomutt, Dog Wonder (voice)
Tracy Morgan
Captain Caveman (voice)
Simon Cowell
Simon Cowell (voice)
Harry Perry
Harry Perry (voice)
Kevin Heffernan
Bike Cop Gary (voice)
John DiMaggio
Restaurant Owner (voice)
Ira Glass
Ira Glass (voice)
Henry Kaufman
Chad / Chet (voice)
Maya Erskine
Judy Takamoto (voice)
Billy West
Muttley (voice)
Don Messick
Muttley (archive audio) (voice)
Fred Tatasciore
Cerberus (voice)
Kennedy Peil
Indira Knight (voice)
John McDaniel
Hal Murphy (voice)
Ryan Folsey
Beach Guy (voice)
Pam Coats
Mrs. Rogers (voice)
Tony Cervone
Ghost / Mr. Rigby / Alice (voice)
Alex Kauffman
Officer North (voice)
Vanara Taing
Baby Rotten (voice)
Sarah Lancia
Dispatcher Stevens (voice)
Eric Cowell
Ben (voice)
Maven Morgan
Kari (voice)
Adam Sztykiel
Officer Casey (voice)
Michael Kurinsky
Samuel Colton (voice)
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