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Nightmare Bitters shrieking in rage

Nightmare Bitters is the Nightmare doppelganger of Ms. Bitters, and as such, she made her only appearance in the "Halloween Spectacular of Spooky Doom". She appears to be the ruler of the Halloweenies and was the main antagonist of the special. Since the Nightmare Realm is located within Dib's mind, then Nightmare Bitters could be viewed as an exaggerated negative representation of how Dib sees his mean-spirited teacher at her worst (which is always).


Nightmare Bitters owns the Nightmare Skool and is a commander of the Halloweenies. The nightmare version of Ms. Bitters leads the operation to get to the real world. She attempts to achieve this by using a device to open up a portal through Dib's head as his mind is the source of her dimension. When Zim rescues Dib, she became so enraged that she transforms into a larger creature. She eventually makes it to the real world, but becomes so horrified by the children and a candy-bloated GIR that she returns to her dimension.


In contrast to Ms. Bitters grumpy personality, she's actually somewhat more childish while still keeping the cruel behavior like her counterpart. She has a bad habit of banishing her underlings to the "Realm of Eternal Screaming and Restlessness" even for things that aren't their fault.



Nightmare Bitters in her monstrous insect-like form

Nightmare Bitters is a large, grotesque, bowlegged creature with a hunch. She wears glasses with a purple tint, and has a multitude of long, striped tentacles protruding from her back. After Zim rescued Dib in the Nightmare Mech, she demonstrated her capability to transform into a giant insect-like creature and gave chase to the pair. Nightmare Bitters wears a ragged purple dress with vertical white letters spelling the word B A D.


  • Nightmare Bitters was not voiced by Lucille Bliss but rather by Rodger Bumpass (who voices Professor Membrane), making her the only female character in the show voiced by a man.
  • Zim seemed to be in shock thar there is another version of Ms. Bitters when they met.