Plot: 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

It's Always Sunny In Philadelphia - Season 8 - Pop-Pop: The Final Solution (Episode 1)
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Episode 2