When the sitcom It's Always Sunny in Philadelphia premiered, there were only four main stars. Relatively unknown at the time, they didn't actually set the ratings on fire. FX gave the show an ultimatum; either bring in a big name or get canceled. The crew reluctantly sought someone who would fit in with their crude, politically incorrect style of humor.
They found the perfect candidate in Danny Devito. It's not hard to think of Danny as crude and boorish, yet lovable. Even when he's rolling in the gutter, it's still hard to dislike him. It was an excellent decision; the ratings soared and the gang just clicked. It would be the start of a hilarious run.
