I, Roommate - S1-E3
Trivia: Bender's apartment number is 00100100 which, on the ASCII chart, is a Dollar sign. (00:05:35)
I, Roommate - S1-E3
Trivia: The title of this episode ("I, Roommate") is a parody of one of Isaac Asimov's books, entitled "I, Robot."
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]