Zim
Richard Steven Horvitz
Voice
Rosearik Rikki Simons
Voice
Andy Berman
Voice
Melissa Fahn
Gaz
Melissa Fahn
Guest Voice
Jocelyn Blue
Guest Voice
Lucille Bliss
Guest Voice
Brad Abrell
Guest Voice
Robert Cait
Professor Membrane
Rodger Bumpass
Guest Voice
John de Lancie
Guest Voice
S. Scott Bullock
Guest Voice
Dave Fouquette
Guest Voice
James Gleason
Almighty Tallest Purple
Kevin McDonald
Guest Voice
Mo Collins
Guest Voice
Brian George
Guest Voice
Matt Ballard
Guest Voice
Lauri Fraser
Guest Voice
Sherman Howard
Guest Voice
John Garry
Guest Voice
Rob Izenberg
Guest Voice
Gary Falcone
Guest Voice
Jason Marsden
Guest Voice
Ted Raimi
Guest Voice
Danny Cooksey
Guest Voice
Wally Wingert
Guest Voice
Kathryn Fiore
Guest Voice
Hope Levy
Guest Voice
David Herman
Guest Voice
Olivia d'Abo
Guest Voice
Paul Greenberg
Guest Voice
Philip Tanzini
Scientist #4 / Germ Woman / Tiny Germ Voice (voice)
Philece Sampler
Guest Voice
Antoinette Spolar
Guest Voice
Adam Paul
Guest Voice
John DiCrosta
Guest Voice
Mary Scheer
Guest Voice
Candi Milo
Guest Voice
Dwight Schultz
Guest Voice
Jeffrey Jones
Guest Voice
André Sogliuzzo
Guest Voice
Diane Michelle
Guest Voice
Kevin Michael Richardson
Guest Voice
Phil LaMarr
Guest Voice
Kerri Kenney
Guest Voice
Michael McDonald
Guest Voice
Jhonen Vasquez
Guest Voice
Danielle Koenig
Guest Voice
Fred Tatasciore
Guest Voice
Janice Kawaye
—
R. Lee Ermey
Guest Voice
Mindy Sterling
Guest Voice
Jim Wise
—
Eliza Schneider
Guest Voice
Eric Trueheart
—
Greg Ellis
—
Dee Bradley Baker