Suggestions by @jamesthethinker

Kate Micucci

as Valeria Richards in Fantastic Four Animated

Iain Armitage

as Franklin Richards in Fantastic Four Animated

Elon Musk

as Science Consultant in Fantastic Four Animated

Jim Cummings

as Dragon Man in Fantastic Four Animated

Robot Sound Effects

as Andy in Fantastic Four Animated

Dan Povenmire

as The Wizard in Fantastic Four Animated

Crispin Freeman

as Peotor in Fantastic Four Animated

Dee Bradley Baker

as Igor in Fantastic Four Animated

Frank Welker

as Mikhlo in Fantastic Four Animated

Clancy Brown

as Galactus in Fantastic Four Animated

Bruce Timm

as Head Character Designer in Fantastic Four Animated

Matt Youngberg

as Story Editor in Fantastic Four Animated

Christian Slater

as Molecule Man in Fantastic Four Animated

Booboo Stewart

as Wyatt Wingfoot in Fantastic Four Animated

Christopher Lloyd

as Willie Lumpkin in Fantastic Four Animated

"Weird Al" Yankovic

as Impossible Man in Fantastic Four Animated

Gina Carano

as Thundra in Fantastic Four Animated

Rodger Bumpass

as Dr. Harvey Elder in Fantastic Four Animated

Jack De Sena

as The Human Torch in Fantastic Four Animated

Mindy Sterling

as Agatha Harkness in Fantastic Four Animated