This is the first manned mission to Jupiter. There are also four other crew members on board the Disco One. Three of the other crew members are killed while on the long journey to the giant planet. The other character that is on this mission is named HAL. HAL is the ship's computer and one of the most remembered movie characters of all time. During an EVA to repair a broken antenna, the two remaining crew finds that the antenna that they were sent to repair was not broken.
Concerned that the ship's computer might be broken, they ask it why it reported an error when there clearly was no error that needed to be fixed. The astronauts, who are quite suspicious of the computer, seek refuge in one of the ship's EVA pods. While in the pod, they discuss what they are going to do about this new development with the computer. They decide that if it continues to malfunction, they will disconnect it from the ship.
They leave the safety of the ship, to follow HAL's original instruction to replace the antenna. Once the astronauts are outside, HAL causes Poole's oxygen hose to break, sending him to die. Bowman tries to return to the ship although HAL has sealed the doors. Bowman finally gets into the ship and deactivates the murderous computer.