Some movies serve the purpose to enlighten or to explore the complexities of the human condition.
Others serve only to entertain, to permit the audience a break from the tedium of life. Galaxy Quest is such a film. There is no heavy plot or great acting moments but sheer comedic fun. The story is simple, a group of actors known best for a SciFi TV show twenty years ago make a living by appearing at fan conventions. The show has become a cult icon and the conventions are full of young viewers that take the show a bit too seriously.