Suggestions by @alecgroskreutz1

Maguma

as Maguma in Teenage Mutant Ninja Turtles: The New Animated Series - Season 1

JB Blanc

as Hunter "Hun" Mason in Teenage Mutant Ninja Turtles: The New Animated Series - Season 1

Shockirus

as Shockirus in Teenage Mutant Ninja Turtles: The New Animated Series - Season 1

Steve Blum

as Leatherhead in Teenage Mutant Ninja Turtles: The New Animated Series - Season 1

Mae Whitman

as Mona Lisa/Lisa Vicnent in Teenage Mutant Ninja Turtles: The New Animated Series - Season 2

Jennifer Hale

as Koya in Teenage Mutant Ninja Turtles - Movie 2: Return of the Shredder

Roger Craig Smith

as Vernon Fenwick in Teenage Mutant Ninja Turtles: The New Animated Series - Season 2

Ben Affleck

as Lt. Col. Clive Goldlighter in The Galaxy Defenders (Version 5)

Gamera

as Gamera in Teenage Mutant Ninja Turtles: The New Animated Series - Season 1

Colleen O'Shaughnessey

as Jillian Amante in Teenage Mutant Ninja Turtles: The New Animated Series - Season 1

Donnie Yen

as Choreographer in The Galaxy Defenders (Version 5)

Lacey Chabert

as Lola Cruz in Teenage Mutant Ninja Turtles: The New Animated Series - Season 2

Ray Park

as Choreographer in The Galaxy Defenders (Version 5)

Michael Dorn

as Dr. Baxter Stockman in Teenage Mutant Ninja Turtles: The New Animated Series - Season 2

Fred Tatasciore

as Rocksteady in Teenage Mutant Ninja Turtles: The New Animated Series - Season 2

Gary Anthony Williams

as Bebop in Teenage Mutant Ninja Turtles: The New Animated Series - Season 2

Kevin Conroy

as Batman/Bruce Wayne in Teenage Mutant Ninja Turtles: The New Animated Series - Season 2

King Ghidorah (Kingu Gidora)

as King Ghidorah in Godzilla: The New Animated Series

Mothra (Mosura)

as Mothra (Imago) in Godzilla: The New Animated Series

Rodan (Radon)

as Rodan in Godzilla: The New Animated Series