Starting Monday, FXX will be available in 72 million homes, per Fox, including on Optimum's Ch. 142, and Ch. 797 HD, and DirecTV's Ch. 619 and Ch. 619 HD (and also on Dish, Verizon FiOS and ATT U-verse, replacing the Fox Soccer channel).

But what exactly does that other "X" mean? Simple: This is FX's comedy offshoot, using some of the channel's best-known comedies -- "It's Always Sunny in Philadelphia," "The League" and "Legit." For reasons that are unclear, "Archer," "Louie" and "Wilfred" will stay at FX, while "Totally Biased With W. Kamau Bell" will air weeknights at 11 on FXX.

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The new channel also has acquired reruns of a number of high-profile comedies and "dramedies," including "How I Met Your Mother," "Arrested Development," "Rescue Me," "Freaks and Geeks," "The Hughleys," "Mad About You," "Spin City" and "Sports Night." Tomorrow, FXX will air a 34-episode marathon of "Parks & Recreation" (7 a.m. to midnight), while "Sunny's" ninth season bows Wednesday at 10 p.m., and the season 5 premiere of "The League" follows at 10:30. "Bell" launches Wednesday, too.

The new channel also will show recent movies, including "Friends With Benefits" (Sept. 11) and "Hall Pass" (Sept. 18).