Suggestions by @ccarbe6062

Grey DeLisle-Griffin

as Mac in The Grim Adventure of Courage the Cowardly Dog -CROSSOVER-

Ben Schwartz

as Blooregard Q Kazoo in The Grim Adventure of Courage the Cowardly Dog -CROSSOVER-

Keith Ferguson

as Blooregard Q Kazoo in The Grim Adventure of Courage the Cowardly Dog -CROSSOVER-

Eric Bauza

as Billy in The Grim Adventure of Courage the Cowardly Dog -CROSSOVER-

Andrew Russell

as Billy in The Grim Adventure of Courage the Cowardly Dog -CROSSOVER-

Grey DeLisle-Griffin

as Mandy in The Grim Adventure of Courage the Cowardly Dog -CROSSOVER-

Merritt Wever

as Mandy in The Grim Adventure of Courage the Cowardly Dog -CROSSOVER-

Tara Strong

as Mandy in The Grim Adventure of Courage the Cowardly Dog -CROSSOVER-

Richard Steven Horvitz

as Billy in The Grim Adventure of Courage the Cowardly Dog -CROSSOVER-

Maurice LaMarche

as Katz in The Grim Adventure of Courage the Cowardly Dog -CROSSOVER-

Maurice LaMarche

as Nergal in The Grim Adventure of Courage the Cowardly Dog -CROSSOVER-

Greg Eagles

as Grim Reaper in The Grim Adventure of Courage the Cowardly Dog -CROSSOVER-

Carl H. Greenblatt

as Fred Fredburger in The Grim Adventure of Courage the Cowardly Dog -CROSSOVER-

Eric Bauza

as Jeff the Spider in The Grim Adventure of Courage the Cowardly Dog -CROSSOVER-

Eric Bauza

as Courage in The Grim Adventure of Courage the Cowardly Dog -CROSSOVER-

Andy Ezrin

as The Man in Gauze in Courage the Cowardly Dog (The Motion Picture)

Jody Gray

as The Man in Gauze in Courage the Cowardly Dog (The Motion Picture)

Beyoncé

as Haunted in Courage the Cowardly Dog (The Motion Picture)

Sam Register

as Executive Producer in Courage the Cowardly Dog (The Motion Picture)

They Might Be Giants

as Courage the Cowardly Dog Song in Courage the Cowardly Dog (The Motion Picture)