Suggestions by @bobmuse

Harrison Ford

as Gen. Halftrack in Beetle Bailey

Jonathan Lipnicki

as Beetle Bailey in Beetle Bailey

Gavin Warren

as Fritz Katzenjammer in The Captain and the Kids

Yakov Smirnoff

as The Inspector in The Captain and the Kids

Arnold Schwarzenegger

as The Captain in The Captain and the Kids

Rosie O'Donnell

as Mrs. Katzenjammer in The Captain and the Kids

Danny Elfman

as Composer in The Grim Adventures of Billy and Mandy

Jack Black

as Sgt. Oliver Snorkel in Beetle Bailey

Christopher Eccleston

as Saw Boss in Jayce and the Wheeled Warriors

Will Smith

as Herc Stomsailor in Jayce and the Wheeled Warriors

Violet Tinnirello

as Flora in Jayce and the Wheeled Warriors

Sylvester McCoy

as Gillian in Jayce and the Wheeled Warriors

Peter Davison

as Audric in Jayce and the Wheeled Warriors

Tom Holland

as Jayce in Jayce and the Wheeled Warriors