Suggestions by @SpiderSonicPrime

Steve Blum

as Venom in Happy Birthday, Spider-Man! (Animated Special)

Jim Cummings

as Shocker in Happy Birthday, Spider-Man! (Animated Special)

Don Stark

as Rhino in Happy Birthday, Spider-Man! (Animated Special)

Rodger Bumpass

as Doc Ock/Dr. Octopus in Happy Birthday, Spider-Man! (Animated Special)

Maria Canals-Barrera

as Rio Morales in Happy Birthday, Spider-Man! (Animated Special)

Vanessa Marshall

as Jean DeWolff in Happy Birthday, Spider-Man! (Animated Special)

Misty Lee

as Jean DeWolff in Happy Birthday, Spider-Man! (Animated Special)

Steven Weber

as George Stacy in Happy Birthday, Spider-Man! (Animated Special)

Emerson Brooks

as Robbie Robertson in Happy Birthday, Spider-Man! (Animated Special)

Natalie Lander

as Liz Allan in Happy Birthday, Spider-Man! (Animated Special)

Greg Berger

as Thing in Happy Birthday, Spider-Man! (Animated Special)

Andrew Morgado

as Thing in Happy Birthday, Spider-Man! (Animated Special)

Quinton Flynn

as Human Torch in Happy Birthday, Spider-Man! (Animated Special)

David Kaufman

as Human Torch in Happy Birthday, Spider-Man! (Animated Special)

Scott Whyte

as Human Torch in Happy Birthday, Spider-Man! (Animated Special)

Lori Alan

as Invisible Woman in Happy Birthday, Spider-Man! (Animated Special)

Erin Torpey

as Invisible Woman in Happy Birthday, Spider-Man! (Animated Special)

Suzie Yeung

as Invisible Woman in Happy Birthday, Spider-Man! (Animated Special)

Beau Weaver

as Mr. Fantastic in Happy Birthday, Spider-Man! (Animated Special)

Ian James Corlett

as Mr. Fantastic in Happy Birthday, Spider-Man! (Animated Special)