The Day the Earth Stood Stupid

This episode introduced Hypnotoad, and Nibbler's talking personality. Not only was the episode funny throughout, it was well thought out for both the main plot and subplot. The main plot, following Nibbler and Leela having a plan to stop the brains was decent, whilst the subplot of Fry confused why everyone on Earth is dumber than him had many funny moments too.

The episode's plot was well rounded and who could have not forgotten the "ALL GLORY TO THE HYPNOTOAD!" scene at the beginning? I thought it was awesome that despite Fry being the smartest, he was still pretty dumb, and had a funny conclusion of confronting the big brain at the end, and making it look like Fry was going to die. Nevertheless, the ending of the episode was great, when nobody believe Fry about the brains, and that Nibbler returned to normal, but this episode had a very good plot, as well as many funny moments.

This episode is great. It's the first we see of Nibbler's double-life and the story of Earth vs the Brain Spawn is nice and epic, just as I like my sci-fi cartoons to be -that is, until they get to a library and things go downhill. It's not to say that the library sequence is bad, because it's not, it's great in fact, it's just not as great as the stuff that happened prior to it.

The episode is also one of Futurama's funniest ever. The first two acts with people behaving stupidly are just incredibly funny. The moment on the news involving a train may just be the funniest thing I've ever seen on Futurama.

There's also a nice little 'shock-twist' near the end which is set up and taken away within a minute, but it still has the impact intended.

This episode is brilliant and it set up for future brilliant episodes involving Nibblonians, Fry being the chosen one and so forth, too.