The Simpson family goes to an amusement park. They go inside of a ride that turns into a spaceship. They do not know that they are being taken to outer space. Two aliens named Kang and Kodos tell the family that they are going to their alien planet. Once they get there, Kang and Kodos put the Simpson family in a cage as prisoners. They get put inside of a zoo. They are told that one person in the family will be eaten for a ritual. They choose Homer Simpson to be the one eaten.