. . "Mr. Sludgey"@en . . . . "Children's Entertainer"@en . . . . . "Mr. Sludgey is a robotic snowman that made his only appearance in The Most Horrible X-Mas Ever, where he told a tale that had happened on Earth two million years ago on Zim when he caused the \"Most Horrible X-Mas Ever\". He was voiced by Fred Tatasciore."@en . . . "Human Technology"@en . . "Mr. Sludgey"@en . "Mr. Sludgey is a robotic snowman that made his only appearance in The Most Horrible X-Mas Ever, where he told a tale that had happened on Earth two million years ago on Zim when he caused the \"Most Horrible X-Mas Ever\". He was voiced by Fred Tatasciore."@en . "Storyteller"@en .