Karl Knave is the main villain of the three part Goosebumps episode, Chillogy. Although not many liked the episode, many fans of the series enjoyed Daniel Kash's performance as the wisecracking psychopath, Karl.
He is the mayor of the model town of Karlsville and a sadistic, megalomaniacal man who likes to make the wishes of children come true, with a sick twist added, of course. The first girl, Jessica, a con artist who always is interested in making more money, is offered a chance to sell the best lemonade ever made on a hot day in Karlsville. She jacks up the prices and the people who can't get enough of the drink pay whatever she demands. Things seem to be going well for Jessica's business, but she gets too greedy and lies that there is only one glass left, forcing people to bid for it. However, she accidentally spills the rest of the pitcher and the angry townsfolk call her a "greedy little pig". Karl literally transforms her into a pig and she barely escapes the rioting citizens of Karlsville. In the second installment of Chillogy, Matthew is sucked into Karlsville where he lives out his dream of being a pro baseball player, only to be placed inside a baseball game run by monsters and living, carnivorous equipment. Matthew escapes as well and his younger brother, lured into the town by a mail scam, is attempted to be turned into plastic. Matthew and Jessica arrive and save him from the grim fate, and narrowly escape Karlsville when Matthew's mother inadvertently vacuums up the dolls from the town, including Karl. However, it is revealed that Karl survived as he crawls out of the vacuum.