The gang tries to come up with a plan when Frank decides to retire on It's Always Sunny in Philadelphia. "Frank Retires" is the ninth episode of the show's tenth season.
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Let's do this! The gang gathers are prepared to seek revenge in this shot from the season finale.
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It's high school reunion time on It's Always Sunny in Philadelphia. You can imagine how well this goes, right?
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Uh-oh. Frank has that look in his eye. This can't be good for anyone.
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It's board game time! During a rainy afternoon, the gang comes up with this creation.
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A storm is approaching Philadelphia. Dee, Charlie and Frank react to that fact here.
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Hooray for Frank! He reunites with his brother on the 10/13/11 episode of It's Always Sunny in Philadelphia.
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Yes, folks, Frank has a brother! Who knew?!? Meet him here.
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It's Always Sunny Quotes

I gotta get my pump on.

Mac

Dee: Who slams a door?
Frank: Babies.
Dennis: That guy has some real growing up to do. Have some repect for Christ's sake... I am legend.