Invader ZIM is an eccentric alien soldier from the planet Irk. He was banished from the Irken Empire after nearly destroying his home planet on an early mission. After begging his superiors, the Almighty Tallest Red and Purple, for another chance, they decide to get rid of him once and for all. They trick him into going on a "secret mission" to an obscure planet at the edge of the universe, a planet with the unlikely name of Earth. Their trick works, and now ZIM is intent on bringing down the human race. He disguises himself as a schoolboy, and now the only person who can stop him is one kid - Dib Membrane, a somewhat insane paranormal researcher, who sees straight through ZIM's disguise and is intent on stopping his reign of terror. But neither ZIM nor Dib is very good at their job, and what results is everything imaginable, from a giant hamster destroying the city to both ZIM and Dib being turned into bologna meat.
Invader ZIM - Zim is the main character. That's why the show is called "Invader Zim." I mean, it wouldn't be called "Invader Zim" if the show wasn't about Zim, was it? Heh, that would be really stupid.

You should know every bit of info on this page if you're a big fan of the show. But...here goes...Zim is an alien from the planet Irk. He was sent on a mission to destroy an "unknown planet", just so his leaders could get rid of him. Yep, that's pretty much it.

Richard Steven Horvitz - Voice of Invader ZIM
Richard Horvitz was born in Los Angeles California in the summer of 1966. He began acting professionally at the age of 10. As a child he appeared in numerous stage productions. Among the most notable, the musical Oliver starring Dick Shawn and Stubby Kaye. Also as a child Richard starred in numerous commercials and made many television guest appearances.

Gir - Gir is Zim's robot. His leaders didn't want to give him a real robot for his fake mission, so they gave him a piece of garbage. Gir has been known to help Zim is some situations, such as stealing Dib's cameras in Battle of the Planets. But other than that, he's pretty much just a dumb robot. Nobody knows what the G stands for. 

Rosearik Rikki Simons - Voice of GIR
Rosearik Rikki Simons is the writer, 3D mechanical illustrator, digital painter and colorist for the alternative comics "Reality Check" and "Sushi Girl." His work is heavily influenced by Japanese manga and anime. He's also worked as a colorist for Jhonen Vasquez on Vasquez' "I Feel Sick". Simons partner on most of his work is his wife, Tavisha.

Dib is Zim's rival. He seems to be the only one who knows Zim is an alien (or the only one who really cares, anyway), and wants to destroy Zim. At the same time, Zim wants to destroy Dib, because Dib just slows down Zim's mission. In rare cases, they work together, but always for their own different reasons. 

Andy Berman - Voice of Dib

Gaz - Gaz is Dib's scary sister. She plays videos games all the time. (Mostly Game Slave, a really popular game in the show.) She generally hates everybody. She also knows Zim is an alien, but really doesn't care. Her only goal in life is to beat her video game. 

Melissa Charles - Voice of Gaz
She is the sister of Tom Fahn and Jonathan Fahn and the sister-in-law of Dorothy Elias-Fahn and Jennie Fahn. Due to a rib injury in 2004, she reportedly could not perform certain dance moves, including lifts. However, she's fine now. Melissa was the featured Coloratura Soloist in Vox Lumiere, a production where eight singers and four musicians perform music to silent films. Auditioned for the voice of Ariel in Disney's "The Little Mermaid" and was called back several times.

Professor Membrane - Professor Membrane is Dib and Gaz's father. He is a scientist, and a very famous one, too. He keeps trying to get Dib away from Paranormal science, and to study real science, but always has no luck. PLEASE NOTE that the Professor's first name is Membrane. That is not his last name. It's his first name. As of right now, Dib and Gaz's last names are unknown. 

Rodger Bumpass - Voice of Professor Membrane

Miss Bitters - Miss Bitters is Zim and Dib's teacher. She is very creepy. It has been confirmed that she is NOT human, but not Irken, since she DID get lice. No one really knows where she came from. She's just creepy. Miss Bitters is voiced by Lucille Bliss. 

Lucille Bliss - Voice of Miss Bitters
Bliss continually went to audition for a voice in Hanna-Barbera cartoons for approximately 20 years. She was then finally cast as the voice of Smurfette on "Smurfs, The" (1981).

Almighy Tallest Red - Almighy Tallest Red is one of the leaders of the Irken race. He's the better leader of the 2, but still usually has no idea what's going on. He enjoys eating snacks, but not as much as Purple. He's the one of thought of getting rid of Zim.

Wally Wingert - Voice of Almighty Tallest Red/Larb's SIR Unit 
He owns the suit that Andy Kaufman wore on the very first Saturday Night Live.

Almighy Tallest Purple - Almighy Tallest Purple is one of the leaders of the Irken race. All he ever cares about is eating, and usually has no idea what's going on.

Kevin McDonald - Almighty Tallest Purple

Zim's Computer - It's just Zim's computer. Zim's Computer really doesn't care about anything. He doesn't know that much about Earth, but tries to help anyway that he can. He is located all over the house, so Zim can communicate with him anywhere. But he grows tired of doing Zim's orders.

Jhonen Vasquez - ZIM's Computer/Old Kid/Brian/Various Voices 
Jhonen Vasquez was born and raised on San Jose's East Side. He graduated from Mount Pleasant High in 1992 and was a one-time film student at De Anza College. Even though he has little formal artistic training, he entered the world of alternative comics, as the writer/creator/artist of such titles as "SQUEE!" and "Johnny, The Homicidal Maniac", both published by Slave Labor Graphics. "SQUEE!" was nominated for several Eisner Awards, the comic industry's equivalent of the Oscars.

Jhonen Vasquez - Creator/Head Writer
Jhonen Vasquez was born and raised on San Jose's East Side. He graduated from Mount Pleasant High in 1992 and was a one-time film student at De Anza College. Even though he has little formal artistic training, he entered the world of alternative comics, as the writer/creator/artist of such titles as "SQUEE!" and "Johnny, The Homicidal Maniac", both published by Slave Labor Graphics. "SQUEE!" was nominated for several Eisner Awards, the comic industry's equivalent of the Oscars.

Frank Conniff - Head Writer
In episode #3.6 of "Mystery Science Theater 3000" (1988) (Time of the Apes) his character had to take care of a baby turned into a grown-up body by an experiment. In episode #1.3 of "Sabrina, the Teenage Witch" (1996), he played a baby turned into a grown-up body by magic.

During his five year run on Mystery Science Theater 3000, he was the one responsible for picking the movies that were shown.

Replaced J. Elvis Weinstein (then known as Josh Weinstein) as Dr. Forrester's assistant henchman on Mystery Science Theater 3000. When Joel Robinson (Joel Hodgson) asked him where Weinstein's character, Dr. Laurence Erhardt or Dr. Larry, was, he simply held up a milk carton with Larry's picture on it and said "He's missing."

Roman Dirge - Writer
As a small, demonic child, Roman Dirge used to draw all the time. What he drew caused a lot of worry in his parents and teachers, and Roman was told never to pursue a career in art, for his style was crude and he wasn't very skilled. Roman still continued to draw, and soon published 'Xenophobe', a low-budget magazine covering the San Diego arts scene. Due to a 'production error', Roman created a small comic for filler in issue one, about the adventures of a cute little dead girl. The comic became an underground hit, and Roman considered making a full comic series out of the little zombie, named Lenore, after his love of Edgar Allen Poe. He showed his scribblings to some folks in San Jose and was picked up by Slave Labor Graphics. But Roman put aside the comics for his first love, magic, and pursued that career for almost a year until Lenore #1 hit the stands.

Rob Hummel - Writer

Danielle Koenig - Writer

Eric Trueheart - Writer