Suggestions by @devlinclements

Eilonwy

as Helena Bonham Carter in Roles That Actors / Actresses Were ALMOST Casted

Taran (Disney)

as Hugh Laurie in Roles That Actors / Actresses Were ALMOST Casted

Orville

as John Cazale in Roles That Actors / Actresses Were ALMOST Casted

Madame Medusa

as Lauren Bacall in Roles That Actors / Actresses Were ALMOST Casted

Snipes

as Richard Kind in Roles That Actors / Actresses Were ALMOST Casted

The Grand Duke of Owls

as Alec Guinness in Roles That Actors / Actresses Were ALMOST Casted

Sir Grimsby

as Jonathan Harris in Roles That Actors / Actresses Were ALMOST Casted

King Triton

as Christopher Plummer in Roles That Actors / Actresses Were ALMOST Casted

Sebastian The Crab (Samuel E Wright)

as Reginald VelJohnson in Roles That Actors / Actresses Were ALMOST Casted

Prince Eric

as Kiefer Sutherland in Roles That Actors / Actresses Were ALMOST Casted

Flounder (The Little Mermaid)

as Macaulay Culkin in Roles That Actors / Actresses Were ALMOST Casted

Dr. David Q. Dawson

as Tim Curry in Roles That Actors / Actresses Were ALMOST Casted

Rachael Lillis

as Smoke in Yin Yang Yo! (4Kids Voice Cast)

Rachael Lillis

as Sailor Mercury / Ami Mizuno in Sailor Moon R (4Kids Dub)

Rachael Lillis

as Sailor Mercury / Ami Mizuno in Sailor Moon (4Kids Dub)

Digimon Adventure

as Anime in Shows that could’ve been dubbed by 4Kids

Jillian Henry

as Sweetie Belle. in My Little Pony: Friendship Is Magic (American Dub)

Scott Rayow

as Tuxedo Mask / Mamoru Chiba in Sailor Moon R (4Kids Dub)

Jaida-Iman Benjamin

as Nala (young) in Once Upon a Studio: The Movie

Kill la Kill

as Worst English Dub in Best And Worst Of: Magical Girl