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is a creature from the Nightmare Realm who makes his only appearance in Halloween Spectacular of Spooky Doom. He was sent to announce that if Dib didn't surrender, Zim would be destroyed. Dib didn't care, and he threw a can at Yolk's head; according to him, "it hurt".

Yolk went back to Nightmare Bitters, and due to his failure, he was condemned to the Realm of Eternal Screaming and Restlessness.

He is shaped somewhat like an egg, which is probably the meaning behind his name. The upper portion of his torso is covered in curved, irregular spines. He possesses four gangly limbs of varied length, with each ending in three-fingered anisodactyl hands. His actual head is on the lower half of his body, above his groin. He also wears a grey cloth, which covers his entire lower torso. He was voiced by Jhonen Vasquez.


  • "He said we can destroy his friend. Then he threw a can at my head. It hurt."