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

Frank: I opened up to a therapist just once. I was a kid. I got into a fight. The doctor asked me question after question, got me so scrambled up. Next thing I know, I was shanghai'd upstate to a nitwit school. You know what a nitwit school is?
Therapist: I assume you mean a school for the mentally disabled.
Frank (spits pistachio shell): Yeah, not just for nuts in the head, but bodies, too. Back then science was real crude, they stuck us all together. My roommate was a frog-kid. You ever see a frog-kid?

No I don't eat dragon, cause, uh, it's not a meal for peasants, it's a meal for kings, and I'm sort of a common man. But they don't eat us, it's a common misconception. They actually eat gold and treasure -- that's why they're always sitting on a pile of it.

Charlie