"Pop-Pop: The Final Solution" is the first episode of the eighth season of It's Always Sunny in Philadelphia. Dennis and Dee's ailing grandfather Pop-Pop is wasting away in the hospital, and they have to decide whether or not to pull the plug. But things get complicated when The Gang learns of Pop-Pop's history as a Nazi, and Mac, Charlie and Frank set off in search of the old man's spoils from the war [in particular, a watercolor of a German shepherd possibly painted by Adolf Hitler].