You probably know that It's Always Sunny in Philadelphia returns with the Season 8 premiere "Pop-Pop: The Final Solution" Thursday, October 11 at 10 PM ET on FX. What you may not know is that there is a whole new cast in place! FX has released a promo and an extended, behind-the-scenes video featuring Haley Joel Osment (Mac), Xzibit (Sweet Dee), Candace Cameron Bure (Charlie), UFC fighter Chael Sonnen (Dennis), and Andrew Dice Clay (Frank). Would you watch this revamped version of the popular FX comedy series? Check out the videos to find out for yourself!