Frank Welker

as Megatron / Mirage / Rumble / Skywarp / Soundwave (voice)

as Self (archive footage)

as Scooby-Doo / Fred Jones (voice)

as Abu / Joanna (voice) (archive sound)

as Scooby-Doo / Rudy / Fred / Nefario (voice)

as Scooby-Doo / Fred Jones / Self

as Scooby-Doo / Fred Jones (voice)

as Additional Voices (voice)

as Curious George (voice)

as Scooby-Doo / Fred Jones / Monster (voice)

as Figaro / Butch (voice)

as Scooby-Doo / Pterodactyl (voice)

as George / Additional Voices (voice)

as Scooby-Doo / Fred Jones (voice)

as Scooby Doo / Fred Jones (voice)

as Cave of Wonders (voice)

as George / Philippe (voice)

as Scooby-Doo / Fred Jones (voice)

as Scooby-Doo / Fred Jones (voice)

as Scooby-Doo / Fred Jones (voice)

as Scooby-Doo / Fred (voice)

as Megatron (voice)

as Astro (voice)

as Sven (voice)

as Scooby-Doo / Fred Jones (voice)

as Azrael (voice)

as (voices)

as Fred Jones / Scooby-Doo (voice)

as Scooby-Doo / Fred Jones (voice)

as Fred / Scooby-Doo (voice)

as Scooby-Doo / Fred Jones (voice)

as Curious George (voice)

as Scooby-Doo / Fred Jones (voice)

as Fred Jones / Scooby Doo (voice)

as Fred / Scooby-Doo (voice)

as Scooby-Doo / Fred Jones (voice)

as Fred Jones / Scooby-Doo (voice)

as Self

as Galvatron (voice)

as —

as Garfield (voice)

as Fred Jones / Scooby-Doo (voice)

as Megatron / Terrorcon (voice)

as Azrael (voice)

as Scooby-Doo / Fred Jones (voice)

as Curious George/Stig/Flint Quint

as Coco the Coconutty Monkey (voice)

as Curious George (voice)

as Scooby-Doo / Fred Jones (voice)

as Azrael (voice)

as Mayor Stevenson / Weather Man (voice)

as Scooby-Doo / Fred (voice)

as Mayor Stevenson (voice)

as Fred Jones / Scooby-Doo (voice)

as Scooby-Doo / Fred Jones (voice)

as Sonya (voice)

as Scooby-Doo / Fred (voice)

as Fred Jones / Scooby-Doo (voice) (archive footage)

as Mannequins / Beast (voice)

as Freddie Jones / Scooby-Doo (voice)

as Scooby-Doo / Fred Jones / Dynomutt (voice)

as Bubble Puppy (voice)

as Curious George (voice)

as Fred Jones (voice)

as Fred Jones / Scooby-Doo (voice)

as Mayor Stevenson / Weather Man (voice)

as Higgens / Bull (voice)

as Scooby-Doo / Fred Jones / Motoshondu (voice) (archive footage)

as Bullseye (voice)

as Azrael (voice)

as —

as Scooby-Doo / Fred Jones / Msicellaneous Bikers (voice)

as Shockwave / Soundwave (voice)

as Scooby-Doo / Fred Jones (voice) (archive footage)

as Azrael (voice)

as Fred Jones (voice) (archive footage)

as Nuts (voice)

as Fred / Scooby Doo (voice)

as Figaro (voice)

as —

as Jabberwocky / Bandersnatch / Jubjub / Bayard (additional voice)

as Dr. Frankenwagon's Monster (voice)

as Scooby-Doo / Fred Jones (voice)

as Scooby-Doo (voice)

as Fred / Scooby-Doo (voice)

as Mark Whitacre's Father

as George (voice)

as Abu (voice) / Lion roars (voice) (archive footage)

as Snortafus

as George / Duck / Cow (voice)

as Garfield / Garzooka / Narrator (voice)

as Scooby-Doo (voice)

as Soundwave / Devastator / Reedman (voice)

as Scooby-Doo (voice)

as Nibbler (voice)

as (voices)

as Garfield / Delivery Gnome / Prop Boy / Leonard / Jeff (voice)

as Scooby-Doo / Fred Jones (voice)

as Garfield / Keith / Prop Boy / Additional Voices (voice)

as Lucifer (voice)

as Chief / Baby Sasquatch (voice)

as Nibbler / Fleb / Seymour (voice)

as Rajah / Abu (voice)

as Megatron (voice)

as Fred Jones / Scooby-Doo (voice)

as (voice)

as —

as (voice)

as Goddard (voice)

as Sparky / Sprout / Mr. Stenchy / Kixx / Hoilo / Slugger (voice)

as Monty Uno (voice)

as Fred Jones / Scooby-Doo (voice)

as Spinosaurus (voice)

as Fred Jones / Scooby-Doo / The Centaur (voice)

as George (voice)

as Scooby-Doo / Fred Jones (voice)

as Scooby-Doo / Fred Jones (voice) (archive footage)

as Spindle / Frog / Caterpillar (voice)

as Additional Voices (voice)

as Spike (voice)

as Abu (voice)

as Velociraptor (voice)

as Self

as Scooby-Doo / Fred Jones / Wiki-Tiki / Interviewer (voice)

as Professor Otto Allenford (voice)

as Fred Jones / Scooby-Doo (voice)

as Fred Jones / Scooby-Doo (voice)

as Fred Jones / Scooby-Doo / Interviewer

as Goddard (voice)

as Goddard (voice)

as Scooby-Doo / Fred Jones / Lachlan Haggart (voice)

as Additional Voices (voice)

as Goddard / Twonkies (voice)

as Fred Jones / Scooby-Doo (voice)

as Cri-Kee (voice)

as Fred Jones / Scooby-Doo (voice)

as Fred / Scooby-Doo (voice)

as Reinaldo (voice)

as Additional Voices (voice)

as Fred Jones / Scooby-Doo (voice)

as Fred Jones / Scooby-Doo (voice)

as Goddard (voice)

as Goddard / Poultra (voice)

as Scooby-Doo / Fred (voice)

as Scooby-Doo (voice)

as Goddard/Poultra (voice)

as Archbishop / Dying King (voice) (archive footage)

as Sparky (voice)

as Jack's Vocal Effects

as Nevins (voice)

as Obby / Mantell (voice)

as Additional Voices (voice)

as Nana II / Octopus (voice)

as Dino / Monkey / Elevator Guy (voice)

as Fred Jones (voice) (archive footage)

as Jerry (Voice)

as Lucifer / Bruno / Pom Pom (voice)

as Fred / Scooby-Doo / Headless Snowman (voice)

as Whole Lotta Monkeys (voice)

as Creature Voices (voice)

as Fred Jones (voice) (archive footage)

as Achilles & Djali (voice)

as Circus Baboon / Security Guard (voice)

as Buddy (voice)

as Abominable Snowman (voice)

as Fred (voice)

as Animal voices

as (voice)

as Sacred Cow (voice)

as Fred Jones (voice) (archive footage)

as Reggie (voice)

as Goddard / Poultra (voice)

as Fred Jones / Jabberjaw (voice)

as (voice)

as Max the Dog (voice)

as Fred Jones (voice) (archive footage)

as Max (voice)

as Fred Jones (voice)

as Werewolf Vocal Effects (voice)

as Bessie the Sea Monster (voice)

as Woof / Ace (voice)

as The Python (voice)

as Altivo (voice)

as The Mayor (voice)

as Hector the Bulldog / Hugo the Abominable Snowman / Mugsy / Penelope Pussycat (voice)

as Additional Voices (voice)

as Fred Jones (voice)

as Fred Jones (voice)

as Pegasus (voice) (archive sound)

as The Monster (voice)

as Monkey

as Herman Melville (voice)

as Turkey / Figaro (voice)

as Fred (voice)

as Parrot Sounds (voice)

as Sultan (voice)

as —

as Fred Jones (voice)

as Bull Connor / Chihuahua (voice)

as Voltaire (voice)