After being threatened with deactivation, Hal frantically killed five astronauts on Discovery One, en route to Jupiter. Only one crew member remained onboard, where the usually helpful computer seized control and depressurized the ship to jettison everyone inside. Though conflicted, Hal either had to kill the last astronaut for his survival or reach a mutual agreement. "I know everything hasn't been quite right with me, but I feel much better now. I really do."