Suggestions by @SpiderSonicPrime

Mark Whitten

as Curt Connors in Happy Amazing Birthday, Spider-Man! (Animated Special)

Matt Lanter

as Flash Thompson in Happy Amazing Birthday, Spider-Man! (Animated Special)

Phil LaMarr

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

Ernie Hudson

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

Nolan North

as John Jameson in Happy Amazing Birthday, Spider-Man! (Animated Special)

J.K. Simmons

as J. Jonah Jameson in Happy Amazing Birthday, Spider-Man! (Animated Special)

Cree Summer

as Glory Grant in Happy Amazing Birthday, Spider-Man! (Animated Special)

Grey DeLisle

as Betty Brant in Happy Amazing Birthday, Spider-Man! (Animated Special)

Andrew Kishino

as Ned Leeds in Happy Amazing Birthday, Spider-Man! (Animated Special)

Alanna Ubach

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

Matt Lanter

as Harry Osborn in Happy Amazing Birthday, Spider-Man! (Animated Special)

Scott Porter

as Harry Osborn in Happy Amazing Birthday, Spider-Man! (Animated Special)

Graham Phillips

as Harry Osborn in Happy Amazing Birthday, Spider-Man! (Animated Special)

Kath Soucie

as Anna Watson in Happy Amazing Birthday, Spider-Man! (Animated Special)

Misty Lee

as May Parker in Happy Amazing Birthday, Spider-Man! (Animated Special)

Nancy Linari

as May Parker in Happy Amazing Birthday, Spider-Man! (Animated Special)

David Boat

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

Matthew Yang King

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

Kari Wahlgren

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

Dee Bradley Baker

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