It's Always Sunny in Philadelphia
The Aluminum Monster vs. Fatty Magoo
S03E05 - Airdate: 2007-09-27
Runtime: 30 min
Dee gets a rude awakening when she discovers that "Fatty Magoo," an overweight loser from her high-school class, is now a svelte, successful clothing-store owner. So Dee decides to design a dress for her, but Dennis decides that he's the better designer. He also knows that he has the charm to sell it to Fatty.
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Episode details and rating from TVmaze.