Suggestions by @SpiderSonicPrime

Stephen Oyoung

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

Steve Blum

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

Fred Tatasciore

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

Erica Lindbeck

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

Jason Spisak

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

Steve Blum

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

Dee Bradley Baker

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

David Agranov

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

Ben Pronsky

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

Dave B. Mitchell

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

Fred Tatasciore

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

Diedrich Bader

as Kraven the Hunter in Happy Birthday, Spider-Man! (Animated Special)

Jim Pirri

as Kraven the Hunter in Happy Birthday, Spider-Man! (Animated Special)

David Kaye

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

Travis Willingham

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

Richard Epcar

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

Josh Keaton

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

Christopher Daniel Barnes

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

Dwight Schultz

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

William Salyers

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