Nostalgia People You Forgot Guest Starred on It's Always Sunny In Philadelphia
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The actors who make up It’s Always Sunny in Philadelphia’s ensemble cast are known for playing a collection of generally terrible human beings, but they’ve had other characters come along to break up the monotony and enter their world. From brief cameos to full-on guest starring roles, these are the It’s Always Sunny In Philadelphia guest appearances that you may have forgotten about.
Josh Groban
Episode: "The Gang Saves The Day"
Role: Himself
Sinbad

Episode: "Dennis Reynolds: An Erotic Life"
Role: Himself
Alexandra Daddario

Episode: "Charlie and Dee Find Love"
Role: Ruby Taft
Dennis Haskins
Episode: "Charlie Got Molested"
Role: Chris Murray