 While watching a 1950s science fiction movie, Bart and Lisa see a commercial for a model rocket kit and Bart orders it by using Homer's credit card number.Homer helps Bart and Milhouse build it, but it blows up before launching.Jealous that Ned Flanders built a superior rocket, Homer enlists the help of his former nerdy college roommates, Gary, Doug, and Benjamin, to build a rocket piloted by the hamster Nibbles.