This episode is easily one of the funniest episodes, if not just for that Waterfall character that dies near the end. He makes this a funny episode.
Zoidberg eats an American Flag on Freedom Day, where people have freedom to do whatever they want. But he eats a flag and everyone hates him. So him and the Decapodians enslave humanity to teach them a thing or two about freedom.
This is a series classic, and this is one of the episodes that makes Zoidberg my favorite character. He is absolutely hilarious and is used quite well in this episode. A+ for sure