Suggestions by @matthewweikert

Rebecca Nagan

as Tootle in Birthday Adventures in Walt Disney World: Episode 2 - Telly's Birthday

Wim Booth

as Timp in Birthday Adventures in Walt Disney World: Episode 2 - Telly's Birthday

Zach Tyler Eisen

as Pablo in Birthday Adventures in Walt Disney World: Episode 2 - Telly's Birthday

Bill Fagerbakke

as Patrick Star in Birthday Adventures in Walt Disney World: Episode 2 - Telly's Birthday

Steve Whitmire

as Wembley Fraggle in Birthday Adventures in Walt Disney World: Episode 2 - Telly's Birthday

Matthew Weikert

as Matthew Weikert in Birthday Adventures in Walt Disney World: Episode 2 - Telly's Birthday

Matthew Weikert

as Writer in Birthday Adventures in Walt Disney World: Episode 2 - Telly's Birthday

Harry Middlebrooks

as Shaker in Birthday Adventures in Walt Disney World: Episode 2 - Telly's Birthday

Peter M. Klimes

as Big Al in Birthday Adventures in Walt Disney World: Episode 2 - Telly's Birthday

Bill Cole

as Wendell in Birthday Adventures in Walt Disney World: Episode 2 - Telly's Birthday

Dave Durham

as Liver Lips McGrowl in Birthday Adventures in Walt Disney World: Episode 2 - Telly's Birthday

Vanessa Hudgens

as Rizzo in Birthday Adventures in Walt Disney World: Episode 2 - Telly's Birthday

Martin P. Robinson

as Telly Monster in Birthday Adventures in Walt Disney World: Episode 2 - Telly's Birthday

Casey Kasem

as Shaggy Rogers in Scoob! (2010)

Casey Kasem

as Shaggy Rogers in Birthday Adventures in Walt Disney World: Episode 1 - Zoe's Birthday

Frank Welker

as Fred Jones in Birthday Adventures in Walt Disney World: Episode 1 - Zoe's Birthday

Grey DeLisle

as Daphne Blake in Birthday Adventures in Walt Disney World: Episode 1 - Zoe's Birthday

Casey Kasem

as Shaggy Rogers in Scooby Doo and Guess Who? (Potential New Episodes)

Dan Aykroyd

as Yogi Bear in Scooby Doo and Guess Who? (Potential New Episodes)

Bill Murray

as Garfield in Scooby Doo and Guess Who? (Potential New Episodes)