It's Always Sunny in Philadelphia: Season 2, Episode 10
Dennis and Dee Get a New Dad (17 Aug. 2006)
TV Episode - - Comedy
When Dennis and Dee discover their mother has lied to them about Frank being their dad, they get to know their real father. Meanwhile, Mac and Charlie attempt to impress Mac's imprisoned father by becoming hardened criminals.
Director:Daniel Attias (as Dan Attias)