Ricky brings the gang to Las Vegas where he is performing. Lucy wants to hunt Uranium in the desert and Ricky doesn't want her to. Anyway, they meet Fred Mac Murray on the train to Las Vegas and he loses a lot of money gambling, so he wants to get on Lucy's scheme too before his wife finds out. To help her Uranium hunting scheme, Lucy has it printed in a fake newspaper and everyone starts looking for Uranium. Everyone is so involved that even Lucy thinks it's true. Anyway, Lucy throws the ""Uranium sample"" away and they later find it not knowing that it's a sample, so they all, not trusting each other try and race to the claims office. Who will get their first? Lucy? The Mertzes? Fred Mac Murray? Now I am not going to spoil that.