Hitler's back. A mad scientist thought he could reform him; make Hitler a productive member of our future society. He was wrong. Now, the only thing standing between mankind and total oblivion is Albert Einstein. Einstein has hand picked the greatest minds in history to face off against this great evil. But who will prevail the latest iteration of The Third Reich? Or the Heroes of Science!

Annotations and commentary

This chapter harkens back to two important things. After reading the script for the first chapter my best friend remarked that Einstein seemed intensely similar to Marv (of Sin City fame). Up to that point I wasn't really sure how to design Einstein, but then everything clicked. Take one part Marv, the wife-beater, the holster, then throw on some khakis, because that's what I figure most scientists wear. Then we have Einstein. That's where "In clown City" comes from.
"In Clown City" is the really obvious Sin City parody arc. Once I decided to move past Hitler I started thinking of the most evil historical figures ever. John Wayne Gacy came up soon, and I decided, "Why not put him in this sort-of clown ghetto, because in the future everybody hates clowns?" Once I named it Clown City I made the connection to Sin City and thus, was the flying bastion of evil born.
Panel 3
The mime has a blank sign. Get it? Clever huh? Shut up.
Protoclown, from an episode of "The Tick" is behind the mime, and the Joker is behind Protoclown.
Panel 4
You can probably easily see execution.jpg here, but that clown being run over by the black blob is supposed to be the famous Tiananmen Square picture.
Panel 8
I'm not really sure why making rude comments at the theatre is on par with a cannibal steak house, but it is.