Nick wants to appear on a show called Smart Mouth because he belives he knows everything. Everyone tells him that he is too young. Nick makes a formula that will make him look older. He tries out for Smart Mouth and bribes Amy into covering for him. Near the end his parents finds out so they made the antidote. Now they must convince Nicky to go back to normal or he will be a grown up forever!
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Ready to Watch Honey I Shrunk the Kids, Season 3, Episode 20?