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Joe is the main antagonist of the 2000 Danish film, Help! I'm a Fish. Joe is a pilot fish, who was formerly a simple cleaner but ended up drinking some of Professor MacKrill's antidote potion, became intelligent, and then decided to take over the seas with an army of equally intelligent sea creatures.
His main minions are a dim-witted Lemon Shark named Shark who just thinks about food and a soldier crab named Crab, who both eventually turned against Joe.