Timmy and Jimmy start their own club, dubbed "the Crips" unaware of the notorious, real life street gang that shares the same name.
Kyle and Kenny agree and leave immediately, but Cartman is sore for being left out of Jimmy and Timmy's newly founded club.
In order to prevent further reprisals, Jimmy decides to call a meeting at the local recreation center between the two gangs, and lock themselves in for the evening until they can sort out their differences.
Reeve continues to use stem cells even after he is healed and becomes addicted to power, and eventually puts together a Legion of Doom made up of villains from the DC, Marvel and South Park universes (though Professor Chaos tells General Disarray that they should "stay out of this one", much like the boys and the T-shirt shopkeeper, Mr. McGillicuddy, did in the A-plot.)
On the creator's commentary, Trey Parker said that because only a few people on the South Park staff (Adrien Beard, Vernon Chatman, and Isaac Hayes who provide the voices of Token Black, Towelie, and Chef respectively) are African American, he had to go out into the street and find three or four black men to record the voices of the Bloods and the Crips.
[1] According to Matt Stone and Trey Parker, they had the idea to do a Christopher Reeve parody since the previous season but held it off: "For a long time we're like, 'You know what?
The two decided to do the parody because they were having trouble coming up with an idea for an episode and Reeve happened to be on Larry King Live that night.