Family Guy - Season 8 Episode 20 - Something, Something, Something, Dark Side

Plot: The story of The Empire Strikes Back is retold. It is the sequel to Blue Harvest. The family experiences another power outage and Peter nearly ventures into telling the story of Black Snake Moan, gets back on track.
 
http://familyguy.wikia.com/wiki/Something,_Something,_Something,_Dark_Side