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He used the slime to capture most of the good and bad characters. He got weak when Donald Duck got a lot of the citizens to fight against the slime. Negaduck then merged with most of the villains to help him try to take over Duckburg until Darkwing, Scrooge, and the other heroes managed to defeat them.
- Since "Dangerous Currency" was never approved by the Walt Disney Company, Slime Negaduck is considered non-canon.