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.
She has glasses that are tinted purple and horns instead of hair, with even more horns curling out of her back. She also wears a purple dress (that has the word "BAD" written vertically downward on it, instead of a black one, and boots with straps and skull-shaped buckles. 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 Dib • Nightmare Gaz • Nightmare Membrane • Nightmare Bitters • Nightmare White Coats|
|Yolk • The Enigma • Hummelflesh, Destroyer of Worlds|
|The Admiral • Bobby Joe Ray Billy Sue • Bride of Mortïs • Cage Monster • Dancing Skeletons • Droogle • Giggles • Gordon Peterson and Gordon Peterson Jr. • Nightmare Nny • Oculord • Oraface • Pepe • Puncher of Heads • Ralfie • The Slobulator|