Sweet Dreams. One of the Things That Go Bump in the Night tries to turn Heloise into a meal, only for her to show who, exactly is in charge. In this is the first thing you ever see of Heloise, you'll get a good mindset into her character.
Spew Tube. After spending a whole episode of being humiliated, laughed at, mocked, and generally having painful things happen to him, Lucius reminds everyone why he's in charge.
The entirety of Pop-Sicles is incredibly awesome from start to finish. Not only do you get to see all the previous Lucius Heinouses, but you even get a brief yet highly effective look at Lucius I, who is so evil even all his descendants are afraid of him.
The Terrific Trio: Finally working together enough to activate their Triple Tech move: "Stink Bubble Bomb!"