Starring: John DiMaggio, Katey Sagal, Tress MacNeille, Billy West, Lauren Tom
Revealing mistake: When Fry starts his speech with "I, Fry", the podium is casting a shadow underneath him, but he isn't. (00:13:50)
Revealing mistake: When someone suggests crying as a way to get the emperor out of Fry's body, he says 'that's a great idea', the emperor's face stays still on Fry's stomach, instead of moving in sync with Fry's body. (00:15:50)
Continuity mistake: When Fry first meets Leela, there's a panel on the wall beside him. It has one red button at the bottom. In subsequent shots it has two buttons. (00:03:50)
Lrr: I am Lrr. Ruler of the planet Omicron Persei 8.
Trivia: The robot devil is voiced by Dan Castellaneta, the voice of Homer Simpson.
Answer: You are thinking about episode 20 of series 2 - "Anthology of Interest I". She technically never kills anyone, but in the episode she ask a "What if machine" (one of the Professor's inventions) what would happen if she was more impulsive. The machine then shows the more impulsive Leela killing off the Professor to get the money from his will and thereafter killing Hermes, Bender, Scruffy, Cubert, Nibler, Amy and Zoidberg to cover it up. Finally she does something really impulsive with Fry.
Andreas[DK]