Due to an apparent shortage of dark matter, which is used to power starships, fuel prices have begun to rise, prompting Professor Farnsworth to prohibit flying the ship unless absolutely necessary, as it would otherwise waste fuel. However, Leela has begun to develop anger issues, leading her to enter the ship in a demolition derby. As punishment, Leela is forced to wear a shock collar that activates whenever she has a violent thought; later in the film, though, she begins to enjoy the shocks and eventually develops an urge to kill things. Meanwhile, Bender feels left out when he sees Cubert and Dwight playing Dungeons & Dragons and cant play because robots are not installed with imaginations. Trying as hard as he can, Bender manages to imagine himself as a medieval knight and joins the game, naming himself Titanius Anglesmith. However, since he was never meant to have an imagination, Bender gradually believes himself to be a real knight in the magical world of Cornwood and, after being subdued during a rampage through the city, is sent to the HAL Institute for Criminally Insane Robots.