|The following information is from the Adventure Time comic book series.|
It may not be part of the same canon or continuity as the animated series.
|"Do you know what Ice King means?!"|
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Hook Crook is a giant spider-scorpion monster who is the dungeon boss of the Nightosphere's Nightmareosphere. He is an "ancient unknowable evil" and apparently is in a "gross-nasty mode."