Richard Steven Horvitz

Zim (voice)

Andy Berman

Dib (voice)

Rosearik Rikki Simons

GIR (voice)

Melissa Fahn

Gaz (voice)

Lucille Bliss

Ms. Bitters (voice)

Rodger Bumpass

Professor Membrane (voice)

Kevin McDonald

Almighty Tallest Purple (voice)

Jhonen Vasquez

Minimoose / Computer / Precocious Kid / Kid in Crowd (voice)

R. Lee Ermey

Acteur

Eliza Schneider

Acteur

S. Scott Bullock

Acteur

Sherman Howard

Oog-Oh (voice)

Dwight Schultz

Acteur

Greg Ellis

Acteur

Danny Cooksey

Acteur

Olivia D'Abo

Acteur

Mo Collins

Acteur

Philece Sampler

Scientist #4 / Germ Woman / Tiny Germ Voice (voice)

Wally Wingert

Red / SIR (voice)

Candi Milo

Girl (voice)

Dee Bradley Baker

Santa Gerg / Guy in Crowd #1 / Cutest Little Kid (voice)

Kathryn Fiore

Kid / Santa Fan #2 / Little Girl (voice)

Jeffrey Jones

Presidentman / Crowd Man / Guy in Crowd #2 (voice)

Brad Abrell

Announcer (voice)

Phil LaMarr

The Letter M (voice)

Michael McDonald

RoboDad / Crewman (voice)