Carol is Keith Partridge's girlfriend. He spends so much money on her, as well as on repairs for his run-down car, that he ends up broke and in debt to most of his family. He can't afford to take Carol to a regular move, so he takes her to a kiddie matinee. Carol is surprised when Keith, who normally has a problem with spending too much money, is suddenly so frugal. She asks him if he's having financial problems. Keith won't be honest with her and pretends he just wanted to see Flash Gordon. Carol doesn't believe him and tells him that he once told her that if two people have to lie to each other, they don't have much of a relationship. Keith still won't be straight with her, but after he realizes there's no way he'll be able to afford to take her to the prom, he is forced to tell her the truth. Carol says she doesn't care about money, she only cares about him. Instead of going to the prom, the two plan to watch the rest of the Flash Gordon serial on TV. Keith realizes he's lucky to have a girlfriend like Carol, so he decides to sell his car and spend the money paying back his family and taking Carol to the prom.