It's Always Sunny's Mac Makes His Triumphant Return to Lost 4.17K Whitney Jefferson 02/10/10 01:50PM Filed to: Lost Lost Rob McElhenney it's always sunny in philadelphia TV Video It's Always Sunny in Philadelphia's Rob McElhenney reprised his role as Aldo on last night's episode of Lost. Did you remember him from years ago? Apparently, Kate didn't either. When awesome shows collide!!!