12. Road To Germany (Season 7, Episode 3)

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This is the fourth episode in the Road to… series of parody episodes and easily the best. After Mort sneaks into Stewie’s room and unknowingly uses his time machine to go back to 1939 Poland, Stewie and Brian are forced to go after him. They just so happen to arrive on the day Poland is invaded by Germany and spend the episode trying to escape the clutches of the Nazis while finding a way back to the present. This one has a great Back to the Future gag, a chance meeting with Winston Churchill, and Stewie impersonating Adolf Hitler. 

11. Da Boom (Season 2, Episode 3)

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While some of the older episodes aren’t great, Da Boom is the exception. Airing a few days before December 31, 1999, the episode finds the Griffin family dealing with life after a nuclear holocaust destroys the earth thanks to the Y2K bug. In this post-apocalyptic world Peter somehow becomes mayor of the new civilization, Stewie interacts with nuclear waste and mutates into a squid, and Randy Newman is found wandering the wastelands. There’s even a bizarre real-life sequence at the end of the episode featuring Dallas stars  Victoria Principal and Patrick Duffy. While certainly strange, this episode has plenty of laughs and some unusual cameos and is one of the best episodes in the series.  

10. The Simpsons Guy (Season 13, Episode 1)

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The crossover everyone had been waiting for. The Griffin family finally meets the Simpson family in this epic episode of television. When the Griffin’s car breaks down near Springfield, they are forced to stay with the Simpsons. Somehow both shows come off great in this one, with all the main characters getting a decent look in. Stewie and Bart become best friends until Stewie starts taking violent revenge on Bart’s enemies. Peter and Homer get along at first but then come to blows, ending with a clever Roadhouse joke. It’s amazing that this show managed to come together successfully and is a one-off animation event that is yet to be bettered.