Trivia: In the beginning, Bender and Fry are watching an episode of "The Scary Door", based on The Twilight Zone. In it, a man is billed as "The Last Man On Earth", and he is walking into a library. This is a mirror of the episode "Time Enough At Last", where the man is the survivor of a bombing holocaust, and winds up at a public library, saying there was time at last to read, but breaks his glasses.
Trivia: As Amy talks to the Hemp party representative, the representative for the Bull Space Moose Party is Bullwinkle J. Moose with antennae on his horns.
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]