9. "The Ricks Must Be Crazy"
Season 2, Episode 6
When Rick shrinks down with Morty to fix his ship's micro-verse battery, he meets his arrogant match in the form of another scientist (voiced brilliantly by Stephen Colbert), who, like Rick, has no qualms with giving authority the finger. "The Ricks Must Be Crazy" is another dense nesting story, one that deals with selfishness, slavery, and accepting one's existence; in terms of humanity, it's not one of Rick's more admirable outings -- but that's exactly why fans of the show's more twisted comedic bits will love this one. (Sorry, Summer -- forever safe, but forever scarred.)