On a cross-country train trip to California, singer Steve, his quirky friend Seymour, and his fiancée Jane, along with her ditzy roommate Irma, find themselves caught up in a whirlwind of chaos and comedy. What starts as a lighthearted journey quickly takes a dark turn when they unwittingly become entangled with a gang of dangerous criminals. As the group stumbles from one misadventure to the next, they end up in the glitzy yet perilous streets of Las Vegas, where their lives are at risk and hilarity ensues as they try to outsmart the gangsters and survive the madness.