Weasel's newest invention is, time traveling underwear! With these underwear, anyone can travel back in time. Baboon over hears the discussion, and decides to steal the time traveling underwear to change history and become the King!
He manages to steal the underwear, but Weasel follows him back into the Stone Age, where all the dinosaurs start laughing when they see Baboon's bright red butt! Not only that, but while laughing, they fall over the edge of the world (the Earth was plat back then, so it all makes sense, of course) Hilarious moments.
Baboon's and Weasel's next stop through history is the Middle Ages, where they attend the invention of glasses! Baboon changes the birth of glasses into the invention of how to cook onion rings: put them on your face and then dive your head in a pot of boiling oil!
Back in our time, Weasel admits that Baboon was the hero, and that if it wasn't for him correcting the errors of the past, the world would be a horrible place today. However, an easier way to cook onion rings has not been invented, and thus the Red Guy has to do so at the diner he works at.
A really good episode, which you won't regret watching.