Ms. Bitters

"Doom, Doom, DOOM!"

- Ms. Bitters "teaching" her class.

Ms. Bitters is the teacher of Zim and Dib's class at Skool. A tall, slender old woman of unknown origin or age, she is devoid of any positive emotion and full of demonic hatred for life. Ms. Bitters was voiced by the late Lucille Bliss. Her first name, if she even has one, is unknown.

She often horrifies her students with grotesque "recollections": she claimed to have once been a fairy princess until she was shocked with a bug zapper in "Halloween Spectacular of Spooky Doom", and in "Career Day" and the Original Pilot she claimed to have been an astronaut until her spaceship imploded. She also has a dark disposition, which she puts to good use in her "lessons". In "A Room with a Moose", one of said "lessons" was to memorize the copyright information of one of the textbooks, and she stated there would be a quiz on it. She was similarly horrific and inept at teaching in Squee!, as she taught the class that Christopher Columbus discovered America in 1429 instead of 1492, even screaming "DESTROY THE NONBELIEVER!" when Squee corrected her, turning his classmates into "textbook zombies".